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Perfect, thank you, I didn't know about the cold side loading options, I've got zapstore and side loaded as a normal hot phone
Agree, multisig is very complicated
But I have to say , I had the 3 phones setup and then created a standard watch wallet on the chromebook by importing the zpubs
Created the tx on watch wallet, signed with 2 cold phones and broadcast with watch wallet
Very cool 😎 and to think electrum has been around since the very early days blows my mind
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In my opinion, multisig is primarily for protocol developers to build things like Lightning Network, side-chains, and for custodians who want distributed signing schemes.
Single signature is fine for individuals (especially beginners). You can achieve multisig-like properties using Shamir's secret sharing, or any number of techniques to split-combine (or even obfuscate) private key material.
At the end of the day, you just need to secure some private data to secure your sats. Multisig just means you have more material to keep secure (more keys, plus wallet descriptors).
But it's great you're learning multisig hands-on!
Android phones let you side-load APK. You can download and verify the new Electrum APK (or build from source) and load it onto the cold phones via USB drive.
Likewise, with Android OS updates, you can apply these from a linux computer over USB cable
adb sideload. Assuming you're able to download the AndroidOS update files onto the linux computer.