I have coins that have been sitting on an old Galaxy S5 in Bitcoin Wallet v 6.41. This version does not seem to be upgradeable anymore.

I have loaded Bitcoin Wallet v 7.11 on a newer Galaxy S9, but when I try to send the coins, it tells me that the address is invalid.

I don't keep up with Bitcoin to be honest, so I'm not sure what is going on. I haven't touched these coins for over 3 years.

Advice?