how to frp mt6737m (phone model mtt l509)
 

Exe version: NCKDongle AndroidMTK 2.7.1
Selected model: 0-By CPU MT6737M
[auto]Action: Reset FRP
Reinsert phone battery.
Battery must be charged.
Phone must be off with battery inside.
Please insert USB cable now...
Detected : USB Serial Device (COM11)
Boot mode: Brom
BBCHIP: 335 0 ca00
Using Algo 2.
Phone detected...Please wait
Sending DA agent, please wait...
[emmi]EMMC CID: 700100454838434538
Error Load Custom Preloader.
Error Load Custom EMMI.
BBCHIP MT6737M
flash id: 700100454838434538
Boot Fail.!!!.
[0]All done.

Action : Meta Info.
Selected Model: 0-By CPU:MT6737M
Exe version: NCKDongle AndroidMTK 2.7.1
Scanning for presents meta ports...
Phone must be off with battery inside.
Please insert USB cable now...
In some phones need to keep VOL- button untill inserting USB cable.
[11]Detected: USB Serial Device (COM11)
\\?\usb#vid_0e8d&pid_0003#5&244bf9db&0&2#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
Starting META mode, wait...
Restarting to meta,wait....
If drivers missing, please install CDC drivers.
This can take up to 5 min on slow phones.
If take too long, check device manager for drivers.
[13]META Port Detected: USB Serial Device (COM13)
USB\VID_0E8D&PID_2006&MI_02\6&372AD5B6&0&0002
Start sync target, waiting responce.....
ChipID: MT6737M,S01
[MT6737M,S01]Using Algo 2
Brand: moviltelco
Board: x2605c_movistar_s6_37m35
Model: L509
Name: moviltelco_L509
Device: moviltelco_L509
Release: L509_movistar_V01_
Version: 6.0
Mediatek Version: alps-mp-m0.mp1-V2.84_wtk6737m.65.m0
Branch: alps-mp-m0.mp1
Security Patch: 2017-04-05
Platform: MT6737M
[MT6737M]Using Algo 2
SIM Count: 2
[0]Starting META using port[COM13], wait...
BaseBand CPU : MT6735, E00
MODEM SW Version : X2605C_MOVISTAR_37_LWG_V0.0.1_S170503
MODEM HW Version : WTK6737M_65_M0_HW
IMEI location: FAT
IMEI[1] : 358303080017532
IMEI[2] : 358303080068576
BarCode: X260D1ZH75263008 10P
[0]All done.

Most posible you meen, how to frp on moviltelco_L509?
mt6737m is supported long time ago.

In your case you have 2 options.
1.
Service phone in preloader mode(connect without press any key, just insert cable when exe ask).

2.
Second option, if you want to press key and phone boot in brom mode, need to load any compatible preloader what contain this flash id: 700100454838434538
flash id: 700100454838434538 seems miss from exe database.