I have a TP-Link MR600 v6 with firmware version specific to Orange PL ISP. Last week I contacted them for software upgrades, they told me thy don't block any upgrades and the device is unlocked. Obviously it's not true as I can't install newer firmware. When I buying it they convinced me that router will be unlocked.

Given all that, -the issue is similar to that one https://community.tp-link.com/en/home/forum/topic/554160?replyId=1189516 except I have Archer MR600 v3.0 00000002 Can you share a link to beta firmware from which I could update to latest EU firmware? Currently I have old one - 1.1.0 0.9.1 v0001.0 Build 230116 Rel.60751n

Kind regards, Vik-2-R

  @Sunshine , any update?

Has anybody got a link to MR600v3 beta firmware? I saw a lot of beta firmwares for V2 yet not a single one for V3.

  @Vik-2-R 

There is a beta EU firmware for JIO 5G isp. ** Be warned ** that you may loose access to other isp and there reports of not being able to restore the stock fw!!

https://community.tp-link.com/en/home/forum/topic/604130

However,

Its likely that beta firmware by itself isn't enough, What's needed is the exact ISP (in your case , orange) -beta- firmware .

This was at least my experience when upgrading an ISP MR600v2 to EU.

Too bad its so difficult and even the ISP isn't aware of the exact details. If your are lucky, Someone in Orange might provide a beta fw.

If you are missing some options like manual 4G band select, I can help you to access it even without changing the firmware.