Борис Макаров

Many thanks to all those who helped me launch the TV-box, I am very grateful to these people who help out newcomers with their advice. Thanks  jock, I deleted brltty using the command:
and oh, a miracle the board worked, the connection to the printer took place!

Driver for integrated Wi-Fi card already compiled to Linux kernel.
So, you should put to the brcm folder:
* exactly one *.bin file, which is firmware for your Wi-Fi card. Kernel may look for this file during boot at several different filenames depending on hardware.
* exactly one *.txt file, which is nvram parameters specific to your Wi-Fi card. Kernel also may try to reach this file at different filenames, but will use just one.
clm_blob not always necessary, you may try to connect without it. Use nmtui command.
*.hcd files - firmware for bluetooth module, if you do not need bluetooth you may safely ignore this files and then bluetooth will not appear in system.
If your Tv-BOX was able to connect to Wi-Fi with the Android image installed, probably is will connect to same Wi-Fi with Armbian too, if the correct files are present in the brcm folder.
In my case (AP6212 wifi module), I found correct files inside backup image I made with Multitool before flashing the Armbian image:
original file was: fw_bcm43436b0.bin renamed: brcmfmac43430b0-sdio.bin
original file was: nvram_ap6212.txt  renamed: brcmfmac43430b0-sdio.txt
You will need to somehow mount a backup copy of the original disk image, then open it as normal disk on regular pc and search for the necessary files.
 

Perhaps this helps:
 

please post output of the following commands while the printer is plugged in the usb and is turned on.
ls /dev/tty*
and
lsusb
 
i never had problems with usb serial communication with armbian before. please check your klipper make menuconfig settings and that it is exactly what is intended for your printer mainboard. here is the guide for your printer.