A: Yes, SX550A chip is the same as SX550J chip, just different production batch.
Here is an upgrade instruction for you reference：
A: G Class device has 10 different languages selectable (English,中文,Espa?ol,Francais,日本語,Korea,Русский,Deutsch,Italiano, Arab), press the fire button 5 times quickly enter the Menu ,then select the language you want ,pls follow below step:
Please do as these steps by steps:
1. Please download the SXi-Q app from the App store and install in your phone (at present, only support ios) Please turn on the bluetooth of your iphone.
2.Please enter the menu, find "BLUETOOTH", choose" BT on" (pull the joystick right means confirmation), then enter" BLUETOOTH" again, turn to " RESTORATION", Long press the fire button until it shows up the bluetooth symbol, then the device will start paring with the phone.
3. Turn on the App, click"connection" and search, and then click the device which has been found and connected. It will show "paring successful".
Then you will find a symbol of bluetooth, device and phone connected symbol on the vaping interface.
A: For safety purposes, we have locked the lowest resistance of G Class at 0.08ohm. If you do need to use the atomizer which the resistance is lower than 0.08ohm, please contact our after-sale service for the upgrade firmware, however we do not suggest using high wattage with low resistance for long time.
A: Please press the joystick for 5 seconds,lock the resistance, then the problem will be solved.
A: The new firmware V5.500 enable users to turn off the SXmini backlight when the brightness setting lower than 3.
A: To lock the resistance, on the main interface please long press the joystick controller for 5 seconds.
A: SXmini G Class is a dual battery device. Max output up to 200watts.