> Maybe there is some trick to update the OS to the current version...?
> Or should I use ChromeOS Flex as an alternative...?
> Can Flex be installed on a machine with original Chromebook firmware...?
> Julius Werner a következőt írta (2023. április 6., csütörtök, 0:08:42 UTC+2):
The OS is at the correct version. You can't install anything else
because you can't boot (right?). Your problem is that your device has
a setting (VPD flag block_devmode=1) stuck that tells it that it is an
enterprise-managed device that is not allowed to be in developer mode,
and another setting (GBB flag 0x39) that tells it it must always be in
developer mode. That is why the OS doesn't allow you to boot (it's
always trying to reboot to disable developer mode, but if developer
mode is forced by a GBB flag it cannot be disabled like this). These
two settings are never supposed to be enabled together, but since
someone removed the firmware write protection and installed unofficial
firmware on the device they got it into an inconsistent state.
Once you manage to boot something that gives you a shell on the board,
you should be able to easily solve the situation by running either
`vpd -i RW_VPD -s block_devmode=0` or
`/usr/share/vboot/bin/set_gbb_flags.sh 0` (or, if neither of those
utilities are available, `flashrom -i RW_VPD -E` should also do the
trick). Your should be able to boot a correctly formatted USB stick
with Ctrl+U, you just need to find one (an official recovery image
doesn't help with this because it doesn't give you a shell). You can
probably find some unofficial image that would work for this on the
internet but I can't help you with that. Or you could install the SDK
and build a test image from source.