Can the OBi1xx be downgraded?

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azrobert:
Awhile ago OBiHai wouldn't allow downgrading firmware on the OBi1xx or the OBi2xx. The last several firmware updates on the OBi2xx allow downgrades. I'm running build 2824 on my OBi110 which can't be downgraded. Does anybody know if build 2872 on the OBi1xx can be downgraded?

Thanks

WelshPaul:
No idea but I have loads of OBi's here so I can find out for you in the morning.

WelshPaul:
I just attempted to downgrade an OBi110 running 2872 and got the dreaded "Firmware downgrading is prohibited " message. So nope you cannot downgrade the firmware if you're running the latest firmware. :(

drgeoff:
@azrobert
Did you just want to know the answer or do you really want to downgrade the firmware on a 110?

If the latter, a general technique is to open the firmware file with a hex editor and change the version number (usually near the start) to be higher than is on the device. But often there is also a checksum which necessitates a futher tweak to avoid the modified file being rejected.

I haven't tried that technique on an OBi.

WelshPaul:
Can you post how to get around the checksum?

Would like to try this myself.

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