Step 1 - Connect the terminal to TrackSol cloud. You need to turn on the Wifi connection. You can refer here on How to connect the terminal to a Wifi network
Step 2 - Then, go to Setting --> and tab on Update Firmware
Step 3 - Key in pin 7531 and press Enter
Step 4 - Then, press Enter again. System will start downloading the latest firmware.
Step 5 - Then, please perform reload menu --> Admin --> Reload Menu --> Reload --> press Enter
Step 6 - Then, please perform update files --> Admin --> Update Files (both products (x) & other files (x))--> press Done --> Update (X) --> press Done