g620s only fastboot

Hello. Please help me repair g620s-l01. Phone stuck on fastboot mode. If i want flash app with sigmasoftwere i got this error:



SigmaKey v.2.28.06
158725886 Sigma dongle 2.28, Initializing...OK
Pack 1: Activated
Pack 2: Activated
Pack 3: Activated
--------- 2018-08-07 16:31:53 ---------
SigmaKey 2.28.06 Qcom: Write firmware
^ Android Sooner Single ADB Interface, Version 0.5, Name: MSM8916, Serial number: a200fc
(ADB) Writing flash...UPDATE.APP
Firmware: G620S-L01V100R001C00B242SP02
This operation may brick the phone! Are you sure you want to proceed? [YES]
Phone model: G620S-L01
Version: G620S-L01V100R001C09B255
Preparing...Unsupported phone model


Flash from sd card not working. Please help me.