Gais I just got the Zyxel 3UK (well it is not ori Zyxel for sure) and there seems to be some issues. I bought from a Shopee seller with the guarantee that if not ori can refund. But anyway I don't really care much if ori, u get what u pay for and as long as it works I'm ok.
Currently testing the unit to check its capabilities with my UMobile SIM (normal postpaid cellular).
Problems:
1. Cannot lock on to 5g-NSA ONLY. Only have these options below. What is the point of the 3UK router if it auto switches and I cannot lock to pure 5G??? I have chosen B28 and N78 cos I have no choice. Is this device broken or modified or something?

2. I speedtested and normal Ookla was 450 Mbps. However Cloudflare only gave 258 Mbps (which is maybe considered "true" speed). But on my Samsuck A phone, I could previously get 650 Mbps from the same SIM card. So I effectively lost about 200 Mbps.
Please note that I am right beside a 5G tower. Like maybe less than 100m away. So it's not the tower. Is it possible that speed will reduce during afternoon? My 650Mbps speed was at 3 am lol.
Cloudflare result:

Ookla result:

This is how close I am:

3. I have reason to believe the device given to me is not new. I found scratch marks in the SIM as well as reset slot. Furthermore when I tried to login admin, the default password was denied so I had to hard reset the device. Before the unit was sent to me, the seller said they were "testing" the device before sending. I know this is one way sellers try to hide that it's not a new unit, but I'm not sure if all these things that I noticed make the case that it is a returned unit. I AM still paying full normal market price even if it is OEM lor.



4. Why are my stats so low? RSRP -54? Shouldnt it be -80? Especially considering I am right beside the tower????? Are the other stats ok?

THANK YOU VERY MUCH, SIFUS!