Originally Posted by paralleluniverse
First of all, www.onyx-boox.com
is not owned by Onyx and it is not Onyx official site. It is just one of many Onyx's distributors...
If you bought M92 at www.onyx-boox.com
(and few other, mainly Polish sites) you have to use their firmware.
If you bought somewhere else, you may use "Booxstor's" firmware, which is also official Onyx firmware.
If you are not sure, try any of those two firmwares. It is possible to install only the right one, the "wrong" will not be installed. So, you cannot make any mistake.