Does anyone know how to achieve the upgrade beyond the supported 9.1 on a PowerMac 7300 with a MAXPowr G3 upgrade? I managed to find a copy of OS9 Helper and I tried to use it with the 9.2.1 upgrade smi I downloaded... but it keeps telling me “An error occurred while copying the disk image.”

Can I just drop a working version of the 9.2.2 system folder on top of my 9.1?