My guess is that you will have to do a hard reset. That is the second set of instructions on the following page. I am not sure you can use the first set to get to safe mode as setup has failed. I find the Tom's Hardware site reliable but if this doesn't work for you, you may have to go to the mobicel support site and seek the hard reset instructions from there.
https://forums.tomshardware.com/threads/mobicel-tablet-keeps-on-crashing.3338895/
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