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You have the 15.1 version, which is very unstable. It is no wonder that your device crashes very frequently. However, as stated, a firmware upgrade (or downgrade) will probably solve the issue. Be sure to look for versions 15.3 or 14.2, the rest are simply not going to solve your problem.
If you don't have an SD card available, you can still do the update. You'll have to follow the updating instructions, but instead of copy-pasting the new firmware file inside the SD card, you'll have to paste it in the reader itself. The procedure is not really hard: once you have the firmware update file in your reader, just switch it off, and then on again. When the switch-on logo appears, press the center button and the upper wing button at the same time and keep them pressed. A command screen will appear soon, and you'll just have to follow the instructions from there.
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