is it possible to change server and/or import transaction from blockchain in electrum android?
1. Click the three dot menu at the top-right corner of the app -> Network.
2. Turn Auto-connect to OFF.
3. Click "Server" -> Choose from peers -> Select a different server.
If you still can't see your transaction history, make sure you have the wallet seed stored somewhere, clear the app data/reinstall the app and restore the wallet.
If for some magic reason you still can't make it work, download Electrum[1] for PC and create a new wallet by restoring the same seed.
[1]
https://electrum.org/