Rooted G1 running 1.6 - have tried various ROMS renamed update.zip on the root level of the FAT32-formatted SD card.
Pointing at them with ROM Manager, and running standard boot to update.zip in Recovery Mode yields the same error:
E:can't open /cache/recovery/command
Pointing at them with ROM Manager, and running standard boot to update.zip in Recovery Mode yields the same error:
E:can't open /cache/recovery/command