I updated from v4 to v. 5.1.0
However the Griudcoin wallet wouldn't even start. Then I removed all folders in recycle bin except my wallet.dat. Then Gridcoin v.5 complains that my wallet.dat is corrupt:
2020-12-07T19:01:45Z Renamed wallet.dat to wallet.1607367705.bak
2020-12-07T19:01:45Z Error: Salvage found errors, all data may not be recoverable.

Then I replaced the walletbackups folder into the GridcoinResearch folder in AppData directory. Still not working:
file unknown has LSN 49/1470961, past end of log at 1/28
Commonly caused by moving a database from one database environment
to another without clearing the database LSNs, or by removing all of
the log files from a database environment
Page 0: metadata page corrupted
Page 0: could not check metadata page
wallet.dat: DB_VERIFY_BAD: Database verification failed
file unknown has LSN 49/1470961, past end of log at 1/1076

How am I supposed to recover my coins or wallet that worked and staked just fine with the v4 wallet?