NL 620 does not recieve 8.1 update.

[Aleksey Krivonkin]

After recovering my NL 620 from W10 to factory firmware (WP8.0) via WPRT, I cannot update my firmware back to WP8.1. It just keeps telling me that my phone is up to date. Tried to install the latest firmware via NLRT, but it also shows that i have the latest firmware. Help, please!

 

[xandros9]

What carrier is this device tied to?
Did you use the Preview for Developer program previously? You may have to do that again.

(Moved to 620 forum)

 

[SpO BoB]

I did the roll back with L.620 I was in PFD before .. So I signed again and updates went alright again ... It should return normal .. I did that when I faced the same issue .... Try Resetting the phone before doing so!

 

[Aleksey Krivonkin]

My phone is untied. I did use PfD program, however, before installing W10 I installed stable firmware, which is not part of Preview for devs.
I also tried to use preview for devs app, but is said, that my OS version should be higher than it is now, so this didn't work for me either. More than that i tried to solve this issue with Microsoft support, but the only solution they offered was to do a hard reset. Which didn't help.

 

[Aleksey Krivonkin]

Check what i have written to xandros9

 

[Aziz Abdurachman]

What is os version of yours?
I was tried W10 too and rever to WP8.1 (cyan, not 8.1 update) using Nokia Software Updater, before it I using Lumia software recovery tools & Windows Phone Software recovery tools but always fail to restore the os/software.
Maybe you can give it a try.

 

[Aleksey Krivonkin]

1030.5603.1304.0000.
Okay. I'll try and tell if it worked!

 

[Aleksey Krivonkin]

What is os version of yours?
I was tried W10 too and rever to WP8.1 (cyan, not 8.1 update) using Nokia Software Updater, before it I using Lumia software recovery tools & Windows Phone Software recovery tools but always fail to restore the os/software.
Maybe you can give it a try.

Nope, it didnt work for me. The available firmware is the same as i already have

 

[Aleksey Krivonkin]

Okay, i found the sollution to this problem.[Tutorial] Flash (unbrand) Lumia devices | Windows Phone 8 Development and Hacking | XDA Forums

 

[SpO BoB]

Okay ! That's good news ,,, wishing a best of luck to you with it )