I think I know why he is trying to use tv boxes, not exacly why I mean, but I have a idea, and its the price. You see, here in BRZ, tv boxes are very cheap, you can find one in the local scrappy sometimes, or even people selling for less then 10-20 USD a used one, almost same price as a brand new ESP32... A Pi Zero I think costs almost 40 USD...
But you are right, this tv boxes all are used components, all fab data on then is from 13 or 12, 10 year old chips, all with solder flux still under them. It's not reliable, specially with wireless. That's why I told him to use ethernet. I have the first one running here for almost 1 month running home-assistant, that is pretty nice. The only brick wall I hit is this limit on 1GB ram, I swaped very DDR3 chips, even with 4 bit ones, and also buyed another box that came with single 2Gig module, called LPDDR2, even discovered that its used on many many phones, I had a Asus Zenphone 2 board laying around and took a look, and find on LPDDR2 Hynix Haha
Unfortunately I still stuck with 1GB xD I think that must be related with you said - hardcoded on the bootloader without source code...