Downgrade Hisilicon Kirin 710 Done Y9 2019 and frp done

[staroooo]

Downgrade Hisilicon Kirin 710 Y9 2019 JKM-lx1 from-JKM-LX1 9.1.0.264-too- 9.1.0.220

--------- 2020-04-28 10:17:00 ---------
SigmaKey 2.35.00 HiSi: Enable downgrade
Connecting...Reboot phone and try again
--------- 2020-04-28 10:17:46 ---------
SigmaKey 2.35.00 HiSi: Write firmware
DBAdapter Reserved Interface (COM88), Provider: Huawei Incorporated, Driver ver.: 2.0.6.725, Date: 12/28/2015, USB\Vid_12D1&Subclass_13&Prot_23
This operation may brick the phone! Are you sure you want to proceed? [YES]
Allow Full OTA files
Hardware IMEI: 020304050607080
Flash file C:\Users\fooxx\Desktop\Jackman-L21 9.1.0.220(C185E1R5P1T8)_Firmware_9.0.0_r3_EMUI9.1. 0_05015JMY File ByABO_WATTAN\dload\update_sd\UPDATE.APP
Writing flash SHA256RSA OK
Writing flash CRC OK
Writing flash CURVER OK
Writing flash VERLIST OK
Writing flash PACKAGE_TYPE OK
Writing flash HISIUFS_GPT OK
Writing flash XLOADER OK
Writing flash FASTBOOT OK
Writing flash DTS OK
Writing flash DTO OK
Writing flash VECTOR OK
Writing flash FW_LPM3 OK
Writing flash HHEE OK
Writing flash TEEOS OK
Writing flash TRUSTFIRMWARE OK
Writing flash SENSORHUB OK
Writing flash FW_HIFI OK
Writing flash KERNEL OK
Writing flash VBMETA OK
Writing flash MODEMNVM_UPDATE OK
Writing flash MODEMNVM_CUST OK
Writing flash RECOVERY_RAMDISK OK
Writing flash RECOVERY_VENDOR OK
Writing flash RECOVERY_VBMETA OK
Writing flash ENG_VENDOR OK
Writing flash ENG_SYSTEM OK
Writing flash CACHE OK
Writing flash SYSTEM OK
Writing flash CUST OK
Writing flash ISP_FIRMWARE OK
Writing flash MODEM_FW OK
Writing flash HISEE_IMG OK
Writing flash HISEE_FS OK
Writing flash VENDOR OK
Writing flash VERSION OK
Writing flash ODM OK
Writing flash PRODUCT OK
Writing flash PREAS OK
Writing flash PREAVS OK
Writing flash USERDATA OK
Writing flash PRELOAD OK
Writing flash ERECOVERY_KERNEL OK
Writing flash ERECOVERY_VENDOR OK
Writing flash ERECOVERY_RAMDISK OK
Writing flash ERECOVERY_VBMETA OK
Writing flash PATCH OK
Flash file C:\Users\fooxx\Desktop\Jackman-L21 9.1.0.220(C185E1R5P1T8)_Firmware_9.0.0_r3_EMUI9.1. 0_05015JMY File ByABO_WATTAN\dload\JKM-L21_hw_meafnaf\update_sd_JKM-L21_hw_meafnaf\update_JKM-L21_hw_meafnaf.app
Writing flash SHA256RSA OK
Writing flash CRC OK
Writing flash CURVER OK
Writing flash VERLIST OK
Writing flash PACKAGE_TYPE OK
Writing flash VERSION OK
Writing flash USERDATA OK
Writing flash PRELOAD OK
Done

[mcandre]

Using FULL OTA UPDATE file

[malka4u]

Originally Posted by staroooo

Downgrade Hisilicon Kirin 710 Y9 2019 JKM-lx1 from-JKM-LX1 9.1.0.264-too- 9.1.0.220

good post mate
although

for this "JKM-LX1 9.1.0.264>>>>>>to >>>>9.1.0.220" you are using very expensive method