Orcus

damn, it looks like I screwed up the WiFi chip model
Actually I have p9012s in my box. And if I understand correctly, there are no drivers for it and it won't work.
 
I had a USB WiFi adapter on a Ralink MT7601U chip. It worked in this box right away.
 
P.S. I still don't understand why I assumed that I have an esp8089 chip. Since I have two such TV boxes, I even disassembled the second one to check - but it also has a c9012p chip. A mystery to me)
___
By the way, the other day after an unsuccessful Armbian firmware update I almost got a brick. If earlier I was able to restore it using a PC and a USB-A - USB-A cable, this time the PC didn't even see this box.
Maybe this will be useful to someone. I revived it by switching to mask mode by shorting contacts on emmc.
launched RK Batch Tool 1.8 and specified the path to the stock firmware (don't forget about the drivers) completely disconnected the power supply to the box shorted contacts 29 and 30 to each other connected the box to the PC. The program immediately recognized it. All that was left was to flash it My box specifications:
Rockchip RK3228A (Aida64 for some reason says that it is 3229), 2/16gb, WiFi S9012P. Board: MXQ_RK3229_V2.0 2019.07.2022
 
 

Just send the one you used to fix HDMI issue. 
This?

Hello, obviously we don't know what you're doing wrong, because if you don't post some logs or other details there is no chance to help with anything. Maybe your emmc is faulty and it will just never work...
Once run, multitool will drop a file on the FAT partition called dmesg.multitool.log with the kernel dmesg log you can post here for inspection.
 
However I would rather erase the internal emmc and try armbian from sdcard instead of burning on emmc.