Bootstrap Loader - Revision history

Dmg210: /* Entering the BSL mode (2.0L) */

2026-07-06T08:52:12Z

Entering the BSL mode (2.0L)

← Older revision		Revision as of 08:52, 6 July 2026
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	[https://github.com/dante383/gkflasher GKFlasher] supports BSL mode.		[https://github.com/dante383/gkflasher GKFlasher] supports BSL mode.

	== Entering ~~the~~ BSL mode (2.0L) ==		== Entering BSL mode (2.0L) ==
	[[File:Boot pin ziome3eg.png\|thumb\|BOOT pin]]		[[File:Boot pin ziome3eg.png\|thumb\|BOOT pin]]

Dmg210: /* Non-immo ECUs */

2026-07-06T08:51:40Z

Non-immo ECUs

← Older revision		Revision as of 08:51, 6 July 2026
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	[https://github.com/dante383/gkflasher GKFlasher] supports BSL mode.		[https://github.com/dante383/gkflasher GKFlasher] supports BSL mode.

	== Entering the BSL mode ==		== Entering the BSL mode (2.0L) ==
	[[File:Boot pin ziome3eg.png\|thumb\|BOOT pin]]		[[File:Boot pin ziome3eg.png\|thumb\|BOOT pin]]

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	# Connect ECU pins 3, 14, 21 and 22 to +12V.		# Connect ECU pins 3, 14, 21 and 22 to +12V.
	# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout.]]		# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout.]]
	# Pull down the BOOT pin to Ground through a 10kΩ resistor.		# Pull down the BOOT pin to Ground through a 10kΩ resistor. (Most V6 ECU's have the resistor onboard).
	# Connect power and ground to the ECU.		# Connect power and ground to the ECU.
	# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher.		# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher.

Ardamir: Changed pin 2 to pin 3, dont want people shorting ground.

2026-07-06T05:30:03Z

Changed pin 2 to pin 3, dont want people shorting ground.

← Older revision		Revision as of 05:30, 6 July 2026
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	=== Non-immo ECUs ===		=== Non-immo ECUs ===

	# Connect ECU pins 2, 14, 21 and 22 to +12V.		# Connect ECU pins 3, 14, 21 and 22 to +12V.
	# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout.]]		# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout.]]
	# Pull down the BOOT pin to Ground through a 10kΩ resistor.		# Pull down the BOOT pin to Ground through a 10kΩ resistor.
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	=== Immo ECUs ===		=== Immo ECUs ===

	# Connect ECU pins 2, 14, 21 and 22 to +12V.		# Connect ECU pins 3, 14, 21 and 22 to +12V.
	# Connect K-Line (pin 77) per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]].		# Connect K-Line (pin 77) per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]].
	#Attach a 470Ω resistor on the [[W-Line\|W-Line<small>(? citation needed)</small>]].		#Attach a 470Ω resistor on the [[W-Line\|W-Line<small>(? citation needed)</small>]].
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	[[File:Bsl pins dmg210.png\|thumb]]If the method above does not work, try the following:		[[File:Bsl pins dmg210.png\|thumb]]If the method above does not work, try the following:

	# Connect ECU pins 2, 14, 21 and 22 to +12V.		# Connect ECU pins 3, 14, 21 and 22 to +12V.
	# Connect K-line (OBD pin 7) to W-Line on the ECU header (pin 47).		# Connect K-line (OBD pin 7) to W-Line on the ECU header (pin 47).
	# Pull down the BOOT pin (pin 28 of the flash chip) to Ground through a 10kΩ resistor.		# Pull down the BOOT pin (pin 28 of the flash chip) to Ground through a 10kΩ resistor.
	# Connect power and ground to the ECU.		# Connect power and ground to the ECU.
	# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher.		# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher.

Ardamir: Added alternate way of flashing through W-Line

2026-07-05T21:35:33Z

Added alternate way of flashing through W-Line

← Older revision		Revision as of 21:35, 5 July 2026
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	This is often used to flash regions of memory inaccessible through OBD2, such as the bootloader. Most notable case would be removing the [[immobiliser]], or performing a ca663056->ca663057 upgrade, which requires changing the bootloader.		This is often used to flash regions of memory inaccessible through OBD2, such as the bootloader. Most notable case would be removing the [[immobiliser]], or performing a ca663056->ca663057 upgrade, which requires changing the bootloader.

	To enter BSL mode, you must ground the BOOT pin and then feed power to the ECU, which will make the CPU wait for input over serial port instead of executing code stored on the flash memory. Then, typically a small loader is uploaded which later ~~faciliates~~ upload and execution of the proper BSL program, which will offer ways to manipulate memory.		To enter BSL mode, you must ground the BOOT pin and then feed power to the ECU, which will make the CPU wait for input over serial port instead of executing code stored on the flash memory. Then, typically a small loader is uploaded which later facilitates upload and execution of the proper BSL program, which will offer ways to manipulate memory.

	[https://github.com/dante383/gkflasher GKFlasher] supports BSL mode		[https://github.com/dante383/gkflasher GKFlasher] supports BSL mode.

	== Entering the BSL mode ==		== Entering the BSL mode ==
Line 14:		Line 14:
	=== Non-immo ECUs ===		=== Non-immo ECUs ===

			# Connect ECU pins 2, 14, 21 and 22 to +12V.
	# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout.]]		# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout.]]
	# Pull down the BOOT pin to Ground through a 10kΩ resistor.		# Pull down the BOOT pin to Ground through a 10kΩ resistor.
	# Connect power to the ECU.		# Connect power and ground to the ECU.
	# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher.		# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher.

	=== Immo ECUs ===		=== Immo ECUs ===

	# Connect K-Line per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]]		# Connect ECU pins 2, 14, 21 and 22 to +12V.
	# ~~[[File:Bsl pins dmg210.png\|thumb]]~~Attach a 470Ω resistor on the [[W-Line\|W-Line<small>(? citation needed)</small>]] ~~and splice~~ [[K-Line]] into [[K-Line]] on the ECU header - if you're using a Y-split OBD2 cable, that'd be [[Data link connector (OBD2)\|pin 9]].		# Connect K-Line (pin 77) per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]].
			#Attach a 470Ω resistor on the [[W-Line\|W-Line<small>(? citation needed)</small>]].
			#Splice [[K-Line]] into [[K-Line]] on the ECU header - if you're using a Y-split OBD2 cable, that'd be [[Data link connector (OBD2)\|pin 9]].
	# Pull down the BOOT pin to Ground through a 10kΩ resistor.		# Pull down the BOOT pin to Ground through a 10kΩ resistor.
	# Connect power to the ECU.		# Connect power and ground to the ECU.
			# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher.
			[[File:Bsl pins dmg210.png\|thumb]]If the method above does not work, try the following:

			# Connect ECU pins 2, 14, 21 and 22 to +12V.
			# Connect K-line (OBD pin 7) to W-Line on the ECU header (pin 47).
			# Pull down the BOOT pin (pin 28 of the flash chip) to Ground through a 10kΩ resistor.
			# Connect power and ground to the ECU.
	# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher.		# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher.

Ardamir: Fixed the part about grounding the BOOT pin. Puling pins hard to ground without a pulldown resistor is dangerous and may cause the I/O circuitry inside the MCU to burn up since it's essentially shorted.

2026-07-05T08:33:32Z

Fixed the part about grounding the BOOT pin. Puling pins hard to ground without a pulldown resistor is dangerous and may cause the I/O circuitry inside the MCU to burn up since it's essentially shorted.

← Older revision		Revision as of 08:33, 5 July 2026
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	=== Non-immo ECUs ===		=== Non-immo ECUs ===

	# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]]		# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout.]]
	# ~~Ground~~ the BOOT pin~~<ref name=":0">You can use~~ a ~~10K~~ resistor~~, then there's no need to disconnect it for the duration of BSL </ref>~~		# Pull down the BOOT pin to Ground through a 10kΩ resistor.
	# Connect power to the ECU		# Connect power to the ECU.
	# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher		# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher.
	~~# Once communication has been estabilished, unground the BOOT pin~~. ~~It is part of the addressing pins and it will cause memory to be corrupted if left grounded~~

	=== Immo ECUs ===		=== Immo ECUs ===

	# Connect K-Line per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]]		# Connect K-Line per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]]
	# [[File:Bsl pins dmg210.png\|thumb]]Attach a ~~470ohm~~ resistor on the [[W-Line\|W-Line<small>(? citation needed)</small>]] and splice [[K-Line]] into [[K-Line]] on the ECU header - if you're using a Y-split OBD2 cable, that'd be [[Data link connector (OBD2)\|pin 9]]		# [[File:Bsl pins dmg210.png\|thumb]]Attach a 470Ω resistor on the [[W-Line\|W-Line<small>(? citation needed)</small>]] and splice [[K-Line]] into [[K-Line]] on the ECU header - if you're using a Y-split OBD2 cable, that'd be [[Data link connector (OBD2)\|pin 9]].
	# ~~Ground~~ the BOOT pin~~<ref name=":0" />~~		# Pull down the BOOT pin to Ground through a 10kΩ resistor.
	# Connect power to the ECU		# Connect power to the ECU.
	# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher		# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher.
	~~# Once communication has been estabilished, unground the BOOT pin~~. ~~It is part of the addressing pins and it will cause memory to be corrupted if left grounded~~

Dante383 at 17:30, 25 June 2026

2026-06-25T17:30:38Z

← Older revision		Revision as of 17:30, 25 June 2026
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	# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]]		# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]]
	# Ground the BOOT pin<ref name=":0">~~Some sources believe~~ a 10K resistor ~~should be used~~ to ~~ground~~ the ~~BOOT pin, but it has been successfully tested with just a simple jumper wire~~</ref>		# Ground the BOOT pin<ref name=":0">You can use a 10K resistor, then there's no need to disconnect it for the duration of BSL </ref>
	# Connect power to the ECU		# Connect power to the ECU
	# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher		# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher

Dante383 at 17:01, 25 June 2026

2026-06-25T17:01:22Z

← Older revision		Revision as of 17:01, 25 June 2026
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	# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]]		# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]]
	# Ground the BOOT pin		# Ground the BOOT pin<ref name=":0">Some sources believe a 10K resistor should be used to ground the BOOT pin, but it has been successfully tested with just a simple jumper wire</ref>
	# Connect power to the ECU		# Connect power to the ECU
	# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher		# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher
Line 24:		Line 24:
	# Connect K-Line per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]]		# Connect K-Line per [[Siemens 5WY 2 Connector Pinout\|ECU pinout]]
	# [[File:Bsl pins dmg210.png\|thumb]]Attach a 470ohm resistor on the [[W-Line\|W-Line<small>(? citation needed)</small>]] and splice [[K-Line]] into [[K-Line]] on the ECU header - if you're using a Y-split OBD2 cable, that'd be [[Data link connector (OBD2)\|pin 9]]		# [[File:Bsl pins dmg210.png\|thumb]]Attach a 470ohm resistor on the [[W-Line\|W-Line<small>(? citation needed)</small>]] and splice [[K-Line]] into [[K-Line]] on the ECU header - if you're using a Y-split OBD2 cable, that'd be [[Data link connector (OBD2)\|pin 9]]
	# Ground the BOOT pin		# Ground the BOOT pin<ref name=":0" />
	# Connect power to the ECU		# Connect power to the ECU
	# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher		# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher
	# Once communication has been estabilished, unground the BOOT pin. It is part of the addressing pins and it will cause memory to be corrupted if left grounded		# Once communication has been estabilished, unground the BOOT pin. It is part of the addressing pins and it will cause memory to be corrupted if left grounded

Dante383: /* Entering the BSL mode */

2026-06-25T16:16:57Z

Entering the BSL mode

← Older revision		Revision as of 16:16, 25 June 2026
Line 10:		Line 10:

	== Entering the BSL mode ==		== Entering the BSL mode ==
			[[File:Boot pin ziome3eg.png\|thumb\|BOOT pin]]

	=== Non-immo ECUs ===		=== Non-immo ECUs ===

Dante383: Created page with "{{Stub}} Bootstrap Loader (BSL) on the C166 MCUs allows to execute code in memory, bypassing code stored on the EEPROM. This is often used to flash regions of memory inaccessible through OBD2, such as the bootloader. Most notable case would be removing the immobiliser, or performing a ca663056->ca663057 upgrade, which requires changing the bootloader. To enter BSL mode, you must ground the BOOT pin and then feed power to the ECU, which will make the CPU wait for i..."

2026-06-25T16:15:14Z

Created page with "{{Stub}} Bootstrap Loader (BSL) on the C166 MCUs allows to execute code in memory, bypassing code stored on the EEPROM. This is often used to flash regions of memory inaccessible through OBD2, such as the bootloader. Most notable case would be removing the immobiliser, or performing a ca663056->ca663057 upgrade, which requires changing the bootloader. To enter BSL mode, you must ground the BOOT pin and then feed power to the ECU, which will make the CPU wait for i..."

New page

{{Stub}}

Bootstrap Loader (BSL) on the C166 MCUs allows to execute code in memory, bypassing code stored on the EEPROM.

This is often used to flash regions of memory inaccessible through OBD2, such as the bootloader. Most notable case would be removing the [[immobiliser]], or performing a ca663056->ca663057 upgrade, which requires changing the bootloader.

To enter BSL mode, you must ground the BOOT pin and then feed power to the ECU, which will make the CPU wait for input over serial port instead of executing code stored on the flash memory. Then, typically a small loader is uploaded which later faciliates upload and execution of the proper BSL program, which will offer ways to manipulate memory.

[https://github.com/dante383/gkflasher GKFlasher] supports BSL mode

== Entering the BSL mode ==

=== Non-immo ECUs ===

# Connect [[K-Line]] per [[Siemens 5WY 2 Connector Pinout|ECU pinout]]
# Ground the BOOT pin
# Connect power to the ECU
# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher
# Once communication has been estabilished, unground the BOOT pin. It is part of the addressing pins and it will cause memory to be corrupted if left grounded

=== Immo ECUs ===

# Connect K-Line per [[Siemens 5WY 2 Connector Pinout|ECU pinout]]
# [[File:Bsl pins dmg210.png|thumb]]Attach a 470ohm resistor on the [[W-Line|W-Line<small>(? citation needed)</small>]] and splice [[K-Line]] into [[K-Line]] on the ECU header - if you're using a Y-split OBD2 cable, that'd be [[Data link connector (OBD2)|pin 9]]
# Ground the BOOT pin
# Connect power to the ECU
# ECU is now ready for BSL input - you can press any button in the BSL tab in GKFlasher
# Once communication has been estabilished, unground the BOOT pin. It is part of the addressing pins and it will cause memory to be corrupted if left grounded