@Sunshine Attached the label

@Sunshine Hello. So if I try the upgrade online I receive the error invalid firmware. If I download the firmware from tplink site and try to update it I receive the error 71211 as visible in the mail.

Hello, I have a TL-MR6400 v4 00000001 with firmware 1.7.0 0.9.1 v0001.0 Build 181214 Rel.49556n. If I launch a check for upgrade I can find the version 1.16.0 0.9.1 v0001.0 Build 191223 Rel.66638n...