After flashing with STM32CubeProgrammer ==> YES
After flashing with ArduinoIDE ==> NO
I did that a while ago but i think its still blocking UART.
I cannot enter the normal mode and upload my code 
Try to flash the factory firmware RAK3172-E_latest_final.hex with STM32CubeProgrammer, as shown in How to Guide: STM32CubeProgrammer for RAK Modules
(1) connect with a serial terminal and send AT+VER=? command to check if the device is working
(2) send AT+BOOT to the device, then try flash your custom firmware
If (1) fails, the device might be damaged. Did you use 3.3V to 5V level shifters between the Arduino UNO and the RAK3172 when you started your project? Direct 5V on the UART lines might cause damage.
I didn’t use arduino anymore. I’m just using the RAK3172.
I typed AT+VER and I did not get a response. but before that, I got a response of just box characters
It’s working perfectly fine now 
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