Looking for older Zyxel GM4100-B0 firmware

Hi everyone,

does anyone happen to have an older firmware version for the Zyxel GM4100-B0?

I’m especially looking for:

V5.18(ACCL.1.1)C0
V5.18(ACCL.1)C0
V5.18(ACCL.1)b2\_G0

The old Studerus file seems to have been called:
GM4100-B0\_Firmware\_5.18(ACCL.1.1)C0.zip

I’d be very grateful for a copy or a working download link. A checksum would also be appreciated.

Thanks!