Question Bricked Bios MSI MAG B550M Bazooka Flash with CH341A

[JerryJG]

After a faulty bios update, the CPU Debug LED lights up permanently.

I tried to flash the bios with a USB, but the red LED flashes for hours, nothing happens.

Now I wanted to flash the bios with a CH341A.
However, I do not know if this is the bios chip (MX25v2033).
In the programs for the CH341A there is not this chip.

Now how can I save the motherboard ?

 

[kerberos_20]

MX25v2033 is 2Mbit SPI chip...doesnt looks like bios chip, B550 mainboards all use 32MB (256Mbit) SPI

 

[drea.drechsler]

After a faulty bios update, the CPU Debug LED lights up permanently.

I tried to flash the bios with a USB, but the red LED flashes for hours, nothing happens.

Now I wanted to flash the bios with a CH341A.
However, I do not know if this is the bios chip (MX25v2033).
In the programs for the CH341A there is not this chip.

Now how can I save the motherboard ?

Don't mess with attempting the CH341A.... use the board's BIOS flashback feature. I suspect the board's also still in warranty so if you simply can't get flashback to work for you contact MSI tech support and start an RMA. You might lose that option if you attempt the CH314A and it damages the board.

Flashback is very picky with the way it works, here's a how-to to help you get it right. Follow instructions to the letter.

View: https://www.youtube.com/watch?v=mwyQ0Sfz_aw

 

[JerryJG]

MX25v2033 is 2Mbit SPI chip...doesnt looks like bios chip, B550 mainboards all use 32MB (256Mbit) SPI

Ah ok thanks. Do you know which chip is the bios chip ?

 

[JerryJG]

Don't mess with attempting the CH341A.... use the board's BIOS flashback feature. I suspect the board's also still in warranty so if you simply can't get flashback to work for you contact MSI tech support and start an RMA. You might lose that option if you attempt the CH314A and it damages the board.

Flashback is very picky with the way it works, here's a how-to to help you get it right. Follow instructions to the letter.

View: https://www.youtube.com/watch?v=mwyQ0Sfz_aw

I tried it by flashing with usb. I have done as in the video, but the led does not stop flashing

 

[kerberos_20]

Ah ok thanks. Do you know which chip is the bios chip ?

cant find any picture online with mobo without heatsinks off

 

[kerberos_20]

its probably this chip

it somewhat matches size of 256MBit SPI nor flash msi is using on another mainboards

like here from tomahawk

which i did found closeup image

which says macronic 256MBit flash on it


just for confirmation, type whats printed on it

 

[JerryJG]

its probably this chip

it somewhat matches size of 256MBit SPI nor flash msi is using on another mainboards

like here from tomahawk

which i did found closeup image

which says macronic 256MBit flash on it


just for confirmation, type whats printed on it

There is the Winbond 25Q256JWEQ. But my programs for the ch341a arent for this chip.
Is it possible to flash this chip with the ch341a ?

 

[kerberos_20]

There is the Winbond 25Q256JWEQ. But my programs for the ch341a arent for this chip.
Is it possible to flash this chip with the ch341a ?

ch341a uses 3.3v, for this spi chip you will need adapter for 1.8v, software support is unknown
revelprog-is can handle it
https://www.reveltronics.com/en/shop/18/8/chip-programmers/revelprog/revelprog-is-serial-device-eeprom-flash-programmer-usb-detail

https://www.reveltronics.com/en/shop/56/12/chip-programmers/accessories-and-adapters/adapter-wson8-8x6-dil8-56-detail

 

[JerryJG]

ch341a uses 3.3v, for this spi chip you will need adapter for 1.8v, software support is unknown
revelprog-is can handle it
https://www.reveltronics.com/en/shop/18/8/chip-programmers/revelprog/revelprog-is-serial-device-eeprom-flash-programmer-usb-detail

https://www.reveltronics.com/en/shop/56/12/chip-programmers/accessories-and-adapters/adapter-wson8-8x6-dil8-56-detail

Ok, thats a bit expensive.
But can I program the chip via the pins JTPM1 on the mainboard?

 

[kerberos_20]

Ok, thats a bit expensive.
But can I program the chip via the pins JTPM1 on the mainboard?

it is
jtpm1 is for TPM, you would need to use JSPI1 if there is one