how to flash this phone in fastboot mode

phone stuck on honor logo and dodnt goto recovery or update menu
only fastboot mode
how i can flash it

——— 2020-10-22 18:24:01 ———
SigmaKey 2.39.04 HiSi: Write firmware
Wrong selection of firmware files can damage the phone.
Are you sure you want to proceed? [YES] Flash file E:HUAWEIJSNJSN-L21 C432 DOWNGRADEJohnson-L21 10.0.0.186(C432E5R3P2)_Firmware_EMUI10.0.0_05015KK Qextupdate_sd_basePTABLE.APP
Phone model: JSN-L21
Version: JSN-L21 10.0.0.224(C432E5R1P3)
Preparing…This Android security patch level is not supported.
Please wait for future updates.
——— 2020-10-22 18:24:29 ———
SigmaKey 2.39.04 HiSi: Get device info
Bootloader unlocked: NO
FB unlocked: NO
Battery voltage: 3.63 V
Phone model: JSN-L21
Build number: JSN-L21 10.0.0.224(C432E5R1P3)
Vendor/Country: hw/eu
System version: Skipped
Android version: 10
Base version: JSN-LGRP2-OVS 10.0.0.224
Custom version: JSN-L21-CUST 10.0.0.5(C432)
Preload version: JSN-L21-PRELOAD 10.0.0.3(C432R1)
Huawei-Over-the-Air info:
C_version: C432
D_version: D000
PLMN: 60601
BoardID: 7611
DeviceName: JSN-L21
Done
——— 2020-10-22 18:24:44 ———
SigmaKey 2.39.04 HiSi: Write firmware
Wrong selection of firmware files can damage the phone.
Are you sure you want to proceed? [YES] Flash file E:HUAWEIJSNJSN-L21 C432 DOWNGRADEJohnson-L21 10.0.0.186(C432E5R3P2)_Firmware_EMUI10.0.0_05015KK Qextupdate_sd_basePTABLE.APP
Phone model: JSN-L21
Version: JSN-L21 10.0.0.224(C432E5R1P3)
Preparing…This Android security patch level is not supported.
Please wait for future updates.

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