Play does not start after attempt to load new firmware

Hello, i loaded the new firmware on my SD card, put in on the play, launched firmware and everything was going smoothly , bar reached 100% quickly and then nothing, for a long time so I tried to shut down the machine and it was impossible. So I removed the power cable. And now my Play does not start anymore…

It happens to me the two previous firmware update I loaded on the machine, each time the unit had to go back to Polyend for a fix.

I hesitate a log time before putting this new update on the machine because of those previous problems.

Any advice?

Thanks a lot.