I easily rooted my tecno camon cx air CXAIR-H3713A-N-170713V106 with adb/fastboot, thanks to Hovatek forum. However both twrp and philz recoveries could not last a reboot. I decided to flash philz with Rashr and it was so easy and smooth like magic. So fellow cx-air owners out there should know that there is already a second ota update for tecno camon cx air pushed out. Asea.