URGENT; need help with downgrade

hi i have jkm-lx1 base firmware is:
JKM-LGRP2-OVS 9.1.0.299

i downgrade with file from support 220 phone stuck in erecovery without showing emergency backup and wipe data..

i flash with 288, 282, 264, phone ok
when i flash with 230 or 220 phone stuck in erecovery.

is there any trick or solution to downgrade to 220, is there any special procedure? thank you in advance.

Code:

Checking fastboot device.....OK
Reading info.....OK
Device Model: JKM-LX1
Device Firmware: :JKM-LX1 9.1.0.288(C185E2)
Base Firmware: :JKM-LGRP2-OVS 9.1.0.299
Custom Firmware: :JKM-LX1-CUST 9.1.0.1(C185)
Preload Firmware: :JKM-L21X-PRELOAD 9.1.0.2(C185R1)
Device FB Lock: LOCKED
Device USER Lock: LOCKED
Device Lock: locked


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