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Bootable SD Card Method with real Firmware

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Offline c_joerg

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Bootable SD Card Method with real Firmware
« on: 22 / December / 2019, 06:15:10 »
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What happens, if a SD card is prepared for the Bootable SD Card Method and there is only a real Firmware on the card?
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Offline srsa_4c

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Re: Bootable SD Card Method with real Firmware
« Reply #1 on: 22 / December / 2019, 10:39:10 »
Quote from: c_joerg on 22 / December / 2019, 06:15:10
What happens, if a SD card is prepared for the Bootable SD Card Method and there is only a real Firmware on the card?
Nothing, unless you enter the Canon menu, find the "firm update" entry and click on it.
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Offline c_joerg

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Re: Bootable SD Card Method with real Firmware
« Reply #2 on: 22 / December / 2019, 11:15:47 »
Quote from: srsa_4c on 22 / December / 2019, 10:39:10
Nothing, unless you enter the Canon menu, find the "firm update" entry and click on it.
My question is actually whether it is possible to carry out a Canon firmware update without a Canon menu?
For example, if parts of the firmware in the camera are destroyed.
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M100 100a, M3 121a, G9x II (1.00c), 2*G1x (101a,100e), S110 (103a), SX50 (100c), SX230 (101a), S45,
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Offline srsa_4c

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Re: Bootable SD Card Method with real Firmware
« Reply #3 on: 22 / December / 2019, 12:33:42 »
Quote from: c_joerg on 22 / December / 2019, 11:15:47
My question is actually whether it is possible to carry out a Canon firmware update without a Canon menu?
For example, if parts of the firmware in the camera are destroyed.
If the main firmware is able to start a diskboot.bin, one could create a special one that is able to reflash the damaged areas. If the damage is extensive enough, many parts of the rom would need to be copied to make diskboot functional.
In some cases (erased or damaged main fw start), the bootloader can also resort to starting diskboot.bin - if it finds one on card.
AFAIK the bootloader cannot deal with firmware update files.
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