@AJDMS Looks like you have EU v5.0 of MR6400 like mine TL-MR6400(EU) ver 5.0 (look for model detail on the white part at the back of your router just above S/N serial numbers ) if its working fine...

@Kevin_Z Update: 2022 Oct TL-MR6400 v5 The router is still working perfectly but Recently discovered something that i didnt notice after firmware update (1.1.0.0.9.1 v0001 Build 201113 Rel63736n)...

@Kevin_Z The above firmware works. It actually solved my previous concerns. 1. SMS received notification but not appearing in sms inbox - SOLVED. 2. Band Selection- SOLVED 3. USSD function not able...

@Christian_LE Christian_LE wrote Hello, looking for a 6400, I have not yet been able to discover V5 or v5.2; however, there is already firmware and emulators in support! I need DynDNS with TP-Link...

@MukeshPandit had the same problem resetting the router fixed it