Successfully reverted back to 8.0 and then got the 8.1 update on my Telus branded Ativ S, by the way, thanks to all those who contributed to this thread as it made the process pretty much painless, anyhow, phone is working well except for one issue which happens to be a biggie, I'm getting a "sim error", not being detected.
So, haven't used the phone in months but when I put it away it was working just fine other than the notorious issues the DP updates inflicted upon it, had a non-active sim card in it as well and never thought much about it, after the updating process I tried two other sims (both active) yet the phone refuses to recognize either, checked all my settings, tried hard resets etc. but nothing appears to resolve my dilemma.
Anyone out there have a similar issue with their Ativ S after going through this process, any suggestions for me to try? Finding it hard to believe my phone miraculously ended up with a hardware malfunction just in an instant (is possible I know), it has never been dropped or abused, if the consensus is that the hardware has failed guess it'll go in my "defunct" bin but would be a shame if that was the case, not worth sending in for repair due to its age yet still a very capable handset even in todays standard.