SM-A520S U4 can not read cert

Brought SM-A520S with a new loader for make dual sim ....

have the opportunity downgrade modem to read cert or combination with U4 loader ?


Chimera Mobile Phone Utility version: 22.26.1327 @ 2019-09-09
Printing phone history

Read Cert
09.09.2019
7:41:37

Read certificate started
Gathering phone info...
Collecting information. Be patient! Do NOT disconnect the phone!
Model: SM-A520S
Sales Code: SKC
Country Code: KOREA
Timezone: Asia/Dushanbe
Android Version: 8.0.0 [R16NW] [SDK 26]
Build Date: Tue Aug 6 17:47:15 KST 2019
PDA Version: A520SKSU4CSH1 [august 2019, rev1]
Phone Version: A520SKSU4CSH1 [august 2019, rev1]
CSC Version: A520SSKC4CSH1 [august 2019, rev1]
Board Platform: EXYNOS5
Modem Platform: SHANNON325
Serial Number: R59J103A3Z
Imei: 354908080173962
Battery Status: 3.96V (57%)
Network Type: GSM
SIM Status: ABSENT
Multisim Config: SS
Knox Version: v30
Warranty Bit: 0
Security Patch: 2019-08-01
Data Encryption State: encrypted
Reading cert...
Checking modem version.
This modem is not appropriate (A520SKSU4CSH1). Please downgrade if possible!
Unsupported modem version.
Finished at local time: [09.09.19 15:45:14]
WorkID: 72584273