sm-j400f same problem

Chimera Mobile Phone Utility version: 20.97.1243 @ 2019-05-06
Printing phone history

Repair IMEI
5/6/2019
2:56:17
PM

Root/Unroot
5/5/2019
2:19:13
PM

Patch certificate started
Gathering phone info...
Collecting information. Be patient! Do NOT disconnect the phone!
Model: SM-J400F
Sales Code: INS
Country Code: India
Timezone: Asia/Kolkata
Android Version: 8.0.0 [R16NW] [SDK 26]
Build Date: Thu Aug 30 15:10:31 KST 2018
PDA Version: J400FXXU2ARH5 [august 2018, rev5]
Phone Version: J400FXXU2ARG8 [july 2018, rev8]
CSC Version: J400FODM2ARH4 [august 2018, rev4]
Product Code: INS
HIDSw Version: J400FXXU2ARH5/J400FODM2ARH4/J400FXXU2ARG8/J400FXXU2ARH5
Board Platform: EXYNOS5
Modem Platform: SHANNON305
Serial Number: RZ8K60R4KPE
Imei: 358129092816144
Unique Number: CQE006522C8A535
Connections: AT,MTP
Battery Status: 3.98V (68%)
Network Type: GSM
SIM Status: ABSENT,ABSENT
Multisim Config: DSDS
Knox Version: v30
Warranty Bit: 0
Security Patch: 2018-07-01
Data Encryption State: encrypted
Preparing...
Checking current patchcert.
Checking modem.
Checking root.
The phone is rooted by: 7.3:UMTSU
Checking boot image. Be patient! Do NOT disconnect the phone!
The knox is still valid. Because of the boot patch the warranty will void.
Writing boot image.
Could not write boot image.
Finished at local time: [05.06.19 20:33:30]
WorkID: 58913211