@Mahmoud1987 Hello, are you trying to configure it as DSL modem router mode or wireless router mode? what is the LED status on it? Please share with us screenshots of the whole Advanced->Status page...

@KVAD Hi, private message has been sent, please have a check and let us know if it helps.

@Terex Hi, private message has been sent, please have a check.

@wibs Hi, Actually the TL-MR100 is an LTE CAT4 product, it doesn't support 4G+, but most smartphone now supports much higher LTE category such as CAT11, CAT20 etc. which are 4G+, or even 5G,...

@someone10 Hi, may I know who your ISP is? and did you try inserting the same SIM card into another 4G device and connect the same client devices to it for comparison? Besides, those issues are...

@Hasanjahid What is the model number and hardware version of your TP-Link device? And which password are you trying to change? Please share with us some screenshots to show the issue first.