eMMC upgrade. SX OS won't boot and licence is invalid.

Strat00s

Noob Account
May 18, 2019
3
1
CZ
Hey everyone. First-time poster as this is the first serious problem I have encountered to this day. What I did: Updated to 7.0.1 (from 6.0.1) and upgraded my eMMC to 128GB. But now, SX OS (2.5.3 obviously but even 2.7.1) won't boot and it also says that licence.dat is invalid. So, what am I supposed to do now? What did I do wrong?
Thanks for any suggestions.