LILYGO TTGO T-A7670E - running modem from battery, hardware or ESP32 code?

Hello, I have a question for professionals regarding the LILYGO® TTGO T-A7670E board, I do not paste the links, because you can google on Ali for 170 zł, and in Poland the highest price is probably 700 zł .
My question is: is the modem boot from the battery pack programmed in hardware, or uploaded code from the ESP32?
Why my question? I bought two boards and one won't fire the modem on battery and the other fires up. The former was plugged in and programmed by Thonny, and to upload the code you have to clear the memory, that's the default setting, so I don't know if I deleted some default code when uploading, or if the board is just faulty.
Please don't laugh at my ignorance (if need be, I'll return the favor with expertise on bees or cookers ), and here I am enjoying tinkering with something, trying to create a gateway that sends temp and weight data.
The latter I've connected for now, but without uploading, then I don't have a preview of the files and no comparison in the shell, only the parameters are displayed.

baru0 wrote:

The former was plugged in and programmed by Thonny, and to upload the code you have to clear the memory, this is the default setting

- This second one was also "plugged in and programmed"?
So the first one doesn't work at all and the second one partially?

The board is just the hardware. The key role is played by the software. It must match the hardware. It is not clear what exactly you have loaded. The phrase "won't fire the modem on battery" doesn't actually say anything. The use of Thonny may indicate Micropython. That is, the board contains the underlying software (Micropython), which can be called an operating system. The Thonny software cannot erase or modify this system. The main task of this system is to interpret the code contained in the files you have uploaded. Connect the board to your computer and run any terminal program with the parameters 115200 bps 8N1. Indicate what messages appear on the screen.