Hi. I purchased a refurbished Samsung S20 5g off ebay from what I thought was a reputable seller. Since having the the phone it won't carry out any updates stuck on Android 11.
Is it possible to reflash and if so advice on what version I would download as ther are so many variations
You can try using Smartswitch on a computer to connect to your phone and see if you can update to newer software this way. It's likely that the phone was purchased through a phone carrier. So without a sim card from that provider, and not being in the country of origin. May not get any of the updates
Have you tried taking out the sim and using a VPN connection to the country where you think the device is from to see if you can get it updated. I used to do this on my previous Nokia device to get the updates when they were weeks behind in the UK.
There are a few options, I have personally done both before but make sure you research on google/youtube if you are not experienced...
You can change the CSC to BTU which is a UK code, by using SamKey on a PC. The phone will then pick up OTA updates. Or, you can use Odin on a PC to manually update the phones firmware.