Almost. I had it in a frankenstein fw4/k1.04 state from trying to install the old firmware back. It had installed the old kernel while leaving the fw4 intact
Glad it worked!
About the CRC error on the first attempt, my best guess is that you were already on FW3/K1.04 when you tried the patched kernel the first time. In that state, the firmware update process may behave differently or run a different...
Please, I posted about this here: https://gbatemp.net/threads/ezflash-air-having-memory-issues-minutes-after-upgrading-to-newer-firmware.683449/post-10904224
Confirmed fix: downgrading from Firmware 4/Kernel 1.05 back to Firmware 3 (tested & working)
Note: I used Claude AI to help to articulate this write-up more clearly than my English allows. All technical findings and the patch itself are real and...