Calculator DEAD after upgrade

[unlockcell]

Hello,

My calculator after upgrade is dead, any ideas?

None of the tutorials for recovery works could help me?

congratulations,

Alexandre

[RichardZ]

Have you tried putting it into recovery mode:
Reset calculator (with a paper clip through a pin hole button on back) while holding the "Symb" button (will display "recovery mode" screen)

If this does not work, you probably have a Hardware defect.