1. I have an old cell phone i bought it on 2019. I installed electrum at that time and didn't update it since then (can't tell if the updates was done automatically) and then i left that cell phone since 2020. Last January i re-opened Electrum in that mobile , i found that i am not able to create a new seed (i have already three previous wallets). Anyone has an explanation?
What version are you using? You can find Electrum version by clicking on the three horizental dots on the top right corner then clicking on
About.
What error message do you get when you try to create a new wallet and are you able to load your old wallets?
2. An old laptop i use since 2019 as a cold storage. The device has windows 7 installed but never updated and an old version of electrum (can't remember the version). Should i upgrade Electrum if i want to keep using the same laptop without upgrading the OS version?
No, don't do that. The latest versions of Electrum
4.2.0 and
4.2.1 will not work on windows7