So when I flash iotbox.img on my SD card with etcher, I see my SD card is divided into two different drives. One says boot the other one is just drive. 

If I put the flashed SD card in rpi 4b 8gb, it boots without any problems and I can use pos as normal. 

I can access the boot drive on my pc but when I try to access the other drive, it tells me I need to format first. If I just close without formatting, I can't access the drive at all. If I chose to format, I see empty drive and it no longer works on my pi anymore. 

I'm trying to access the drive to configure and customize XML files but I'm stuck... I think the drive I can not access is where all those customizable filed are stored at but ffs I can not figure out what's wrong with it... I tried with different SD card, different usb port, different card reader, even tried with different posbox file that's not the latest... All ended up with same results.... Please help me... I just want to customize my receipt..... 😭