Wireless Joint

Yo mymens.
I am such a dodo.
Bought this booster kit https://www.amazon.com/gp/product/B08GYYWMCW/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 .
But I can't hook up the external antenna to the indoor box because cable's ends are too thick, can't get them thru the existing hole in the wall.
I ...

Fellas I know that IMEI changes might be illegal in the US and what not.
I am just trying to not run afoul of the provider's terms of service cuz I want to replace
the crappy mifi device they sent me with a solid capable device and add a nice antenna.
I am looking to change the IMEI of a netgear ...