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Kept trying, was able to recover without the go7-rec.img. Go 7 (B/W) is recovered.
Flashing original boot images back via EDL did not fix it.
What worked:
EDL cable to get back into 9008 mode (no software path from fastboot to EDL exists on this device)
Flashed FP4 ABL, frp_oemunlock, stock boot/recovery from decrypted 4.1.1 firmware, and Renate's misc-recovery via EDL
Erased devinfo partition (frp_oemunlock alone was not enough to unlock, devinfo wipe was required)
fastboot reboot recovery from the now-functional FP4 ABL
Recovery screen rendered on e-ink. Page turn buttons work as volume up/down. Selected "Factory data reset"
Device booted. Restored stock ABL/FRP/devinfo from backups via EDL.
For anyone else in this situation: buy an EDL cable. It's the only way back in once you're stuck in fastboot with the locked stock bootloader. I used bkerler's Python edl tool from WSL2 since Windows fastboot had persistent driver issues with this device.
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