what is the current firmware version? I don't suggest try TL-WR941ND, as it may damage the router.

hi coupai, how long have you been using this router? maybe the router is old

see here, https://www.speedguide.net/faq/is-5ghz-wireless-better-than-24ghz-340

with wifi off and using date internet or connecting to other wifi, can you use Netflix? what is the model of your android phone? Have you tried firmware upgrade for the router? If firmware upgrade...

when you login router management page(192.168.1.1), you will see basic on the top--wireless---change the name and password there. about how to login, refer to this....

when you reset it, do you see all the lights go on and off quickly? i believe the hole is the reset one. Use a pin/paper clip to hold it till all lights go on and off quickly. Later try again. You...