Restoring from old paper Mycelium Wallet Backup
I would suggest asking this question on the mycelium issue topic. Either for android or ios. Generally for the backups in that time bip39 was a main standard as per https://walletsrecovery.org/ - mycelium was supporting WIF (wallet import format). Knowing the derivation paths, one can recover from it in the wallet that supports WIF (like electrum?).