@Kevin_Z I confirm that my router is a MR600 V2 latest firmware: 1.3.0 0.9.1 v0001.0 Build 210208 Rel.61056n I did several tesst with my 4G provider: I tested a second sim card from same provider...

Hello all Same issue and errorcode 56 with french provider Bouygues Telecom Seems not releated to one provider ....