[Other Tools & General Discussion] algomono:
Hi, I have a similar problem here. After trying downgrade my JNY-L21 i got it softbricked. Screen is completely off but at least it recognized by hisuite after adding phone in hisuiteconfig. So I was trying different firmwares to recover but no luck. I'm too get recovery failed after 99% installing recovery.

Here's end of my systemupdate log

[2021-05-29 07:19:46:306][L2_VIM][sn=29][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: full_recovery result body=[{"status": "0","versionPackageCheckResults": [{"status": "0","autoPollingCycle": "1","versionPackageType": 2,"components": [{"versionID": "532627","version": "JNY-LGRP2-OVS 10.1.0.314","name": "JNY-LGRP2-OVS 10.1.0.314","pointVersion": "1","versionType": "1","url": "http://update.dbankcdn.com/download/data/pub_13/HWHOTA_hota_900_9/03/v3/TVk_Hmu4SNuiyVXNuBJIvQ/","createTime": "2020-04-02T07:02:39+0000","componentID": 1,"description": "","reserveUrl": "updatessl.dbankcdn.com","ruleAttr": ""}],"checkEnd": "1"},{"status": "0","autoPollingCycle": "1","components": [{"componentID": 1,"createTime": "2020-04-02T06:33:41+0000","description": "","name": "JNY-L21-CUST 10.1.0.4(C185)","pointVersion": "2","reserveUrl": "updatessl.dbankcdn.com","ruleAttr": "","url": "http://update.dbankcdn.com/download/data/pub_13/HWHOTA_hotaMigrate_900_9/31/v3/ccfba76ed6f64e40b2c37cc4697cb744/","version": "JNY-L21-CUST 10.1.0.4(C185)","versionID": "492238"}],"versionPackageType": 3,"checkEnd": "1"},{"status": "0","autoPollingCycle": "1","components": [{"componentID": 1,"createTime": "2020-04-02T06:33:41+0000","description": "","name": "JNY-L21-PRELOAD 10.1.0.1(C185R6)","pointVersion": "2","reserveUrl": "updatessl.dbankcdn.com","ruleAttr": "","url": "http://update.dbankcdn.com/download/data/pub_13/HWHOTA_hotaMigrate_900_9/75/v3/6c69d8f6637f40a0b121c26341158c15/","version": "JNY-L21-PRELOAD 10.1.0.1(C185R6)","versionID": "448112"}],"versionPackageType": 4,"checkEnd": "1"}]}][tid=9452]]]]
[2021-05-29 07:19:47:421][L2_VIM][sn=30][RESULT: TRUE][HiSuite_SystemUpdate][[[CAUSE: ?]]][[[DATA1: localFullBase is:NA localFullCust is:NA localFullPreload is:NA[tid=9452]]]][[[DATA2: ?]]][[[DATA3: ?]]]
[2021-05-29 07:19:47:421][L2_VIM][sn=31][RESULT: TRUE][HiSuite_SystemUpdate][[[CAUSE: -]]][[[DATA1: localPartBaseGbc is:NA localPartCusGbc is:NA[tid=9452]]]][[[DATA2: ]]][[[DATA3: ?]]]
[2021-05-29 07:19:47:421][L2_VIM][sn=32][RESULT: TRUE][HiSuite_SystemUpdate][[[CAUSE: ?]]][[[DATA1: localPartBaseGbp is:NA localPartPreloadGbp is:NA[tid=9452]]]][[[DATA2: ?]]][[[DATA3: ?]]]
[2021-05-29 07:19:48:479][L2_VIM][sn=33][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: m_mainFiles??: 0 *********m_newFiles??: 3\n[tid=9452]]]]
[2021-05-29 07:20:01:031][L2_VIM][sn=34][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: DownloadFileEnd get taskid: 2 \n[tid=8652]]]]
[2021-05-29 07:20:01:492][L2_VIM][sn=35][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: sha256 match.[tid=8652]]]]
[2021-05-29 07:21:22:628][L2_VIM][sn=36][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: DownloadFileEnd get taskid: 3 \n[tid=2968]]]]
[2021-05-29 07:21:25:445][L2_VIM][sn=37][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: sha256 match.[tid=2968]]]]
[2021-05-29 07:26:37:983][L2_VIM][sn=38][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: DownloadFileEnd get taskid: 1 \n[tid=1152]]]]
[2021-05-29 07:26:57:254][L2_VIM][sn=39][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: sha256 match.[tid=1152]]]]
[2021-05-29 07:26:57:254][L2_VIM][sn=40][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: Download all zip file suc.[tid=1152]]]]
[2021-05-29 07:26:57:255][L2_VIM][sn=41][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: Unzip file: C:\Users\Suika\Documents\Hisuite\ROM/JNY-LGRP2-OVS 10.1.0.314/full/update_full_base.zip[tid=6424]]]]
[2021-05-29 07:26:57:257][L2_VIM][sn=42][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: EventProc Unzip[tid=9452]]]]
[2021-05-29 07:26:57:257][L2_VIM][sn=43][RESULT: TRUE][HiSuite_SystemUpdate][[[CAUSE: ?]]][[[DATA1: exit GetZipFiles 3[tid=9452]]]][[[DATA2: ?]]][[[DATA3: ?]]]
[2021-05-29 07:27:57:048][L2_VIM][sn=44][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: appFile: C:\Users\Suika\Documents\Hisuite\ROM/JNY-LGRP2-OVS 10.1.0.314/full/update_full_base_temp\USERDATA.APP no exist[tid=9452]]]]
[2021-05-29 07:27:57:049][L2_VIM][sn=45][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: appFile: C:\Users\Suika\Documents\Hisuite\ROM/JNY-L21-CUST 10.1.0.4(C185)/full/update_full_cust_JNY-L21_hw_meafnaf_temp\USERDATA.APP no exist[tid=9452]]]]
[2021-05-29 07:27:57:049][L2_VIM][sn=46][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: appFile: C:\Users\Suika\Documents\Hisuite\ROM/JNY-L21-PRELOAD 10.1.0.1(C185R6)/full/update_full_preload_JNY-L21_hw_meafnaf_R6_temp\USERDATA.APP no exist[tid=9452]]]]
[2021-05-29 07:27:57:049][L2_VIM][sn=47][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: m_romFile: C:\Users\Suika\Documents\Hisuite\ROM/JNY-LGRP2-OVS 10.1.0.314/full/update_full_base_temp\UPDATE.APP[tid=6424]]]]
[2021-05-29 07:28:33:125][L2_VIM][sn=48][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: cmd[fastboot flash rescue_recovery_boot "C:\Users\Suika\Documents\Hisuite\ROM/JNY-LGRP2-OVS 10.1.0.314/full/update_full_base_temp\recoveryboot.img"] return [Sending 'rescue_recovery_boot' (46080 KB) OKAY [ 1.264s]\r\nWriting 'rescue_recovery_boot' OKAY [ 0.025s]\r\nFinished. Total time: 1.385s\r\n][tid=9540]]]]
[2021-05-29 07:28:34:221][L2_VIM][sn=49][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: cmd[fastboot flash rescue_recovery_ramdisk "C:\Users\Suika\Documents\Hisuite\ROM/JNY-LGRP2-OVS 10.1.0.314/full/update_full_base_temp\recovery_ramdisk.img"] return [Sending 'rescue_recovery_ramdisk' (32768 KB) OKAY [ 0.904s]\r\nWriting 'rescue_recovery_ramdisk' OKAY [ 0.025s]\r\nFinished. Total time: 1.023s\r\n][tid=9540]]]]
[2021-05-29 07:28:34:821][L2_VIM][sn=50][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: cmd[fastboot flash rescue_recovery_vendor "C:\Users\Suika\Documents\Hisuite\ROM/JNY-LGRP2-OVS 10.1.0.314/full/update_full_base_temp\recovery_vendor.img"] return [Sending 'rescue_recovery_vendor' (16384 KB) OKAY [ 0.454s]\r\nWriting 'rescue_recovery_vendor' OKAY [ 0.021s]\r\nFinished. Total time: 0.525s\r\n][tid=9540]]]]
[2021-05-29 07:28:34:895][L2_VIM][sn=51][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: GetUGSPortInfo return rescue_ugs_port: UGSA\r\nFinished. Total time: 0.001s\r\n[tid=9540]]]]
[2021-05-29 07:28:36:302][L2_VIM][sn=52][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: EnterRecovery return rescue_enter_recovery: start to hisuite mode!\r\nFinished. Total time: 1.329s\r\n[tid=9540]]]]
[2021-05-29 07:28:36:302][L2_VIM][sn=53][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: Diag port is no available[tid=9540]]]]
[2021-05-29 07:32:16:526][L2_VIM][sn=54][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: RepairLogic::UpdateStatus 3[tid=12404]]]]

After scrolling through the log i see the same error's like 'Read oeminfo item failed' or 'Command not allowed'