You can remove frp of lenovo KA5348 very easily, no need any technicality and no need to use complicated methods to remove the account. Just use Uni-Android Tool for this purpose. Open the uni android tool and click on option frp after do this you can see Lenovo brand, now you need to select the lenovo brand and hit the reset button, thats all.But before this process your phone need to connect in fast mode, no need adb mode.
You can unlock this phone with small trick of z3x box. Just select the A520F in the z3x box. Reset the msl first with any tool before the unlock process. After the reset msl, you can do unlock process start with z3x box. Log info here: Searching Samsung modem... detected COM48 Reading phone info... Ok Model: SM-G950F AP version: G950FXXU1AQDG CSC version: G950FOXM1AQDG CP version: G950FXXU1AQDG Product code: BTU Phone SN: R58J50BJKGD Unique number: CE031713EA75B42802 Reading IMEI... Ok IMEI: 35****............. Reading SN... Ok Phone SN: R58J50BJKG Enter MSL: 1740173924543319364849371450032F Bypass MSL... Ok Unlocking... Ok Codes set to 00000000 Rebooting phone... Ok Unlock done Done with Samsung Tool PRO v.28.2