Sm-g955f after patch cert phone reboot show auto flight mode

Patch certificate started
Gathering phone info...
Collecting information. Be patient! Do NOT disconnect the phone!
Model: SM-G955F
Sales Code: INS
Country Code: India
Timezone: Asia/Kolkata
Android Version: 8.0.0 [R16NW] [SDK 26]
Build Date: Wed Dec 26 11:36:58 KST 2018
PDA Version: G955FXXS4CRLB [december 2018, revB]
Phone Version: G955FXXU4ARI1 [september 2018, rev1]
CSC Version: G955FOXM4CRL1 [december 2018, rev1]
Board Platform: EXYNOS5
Modem Platform: SHANNON355
Serial Number: RZxxxxx
Imei: 35xxxx
Battery Status: 3.85V (53%)
Network Type: GSM
SIM Status: ABSENT,ABSENT
Multisim Config: DSDS
Knox Version: v30
Warranty Bit: 1
Security Patch: 2019-01-01
Data Encryption State: encrypted
Preparing...
Checking current patchcert.
Checking modem.
Checking root.
Checking boot image. Be patient! Do NOT disconnect the phone!
Writing boot image.
Restarting phone.
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!
Reading data...
Checking modem version.
Reading data. Be patient! Do NOT disconnect the phone!
Patching certificate...
Communicating with the server. Be patient! Do NOT disconnect the phone!
After the phone starts, it switches to flying mode and then returns to normal mode after 20-70 seconds.
You can check the status of the imei using: *#0011#
The patchcert can be removed by repeating the process.
If a new firmware is used, the patchcert process must be repeated.
Succeeded.
Successfully finished.
Finished at local time: [03.30.19 14:17:20]


after reboot phon ok But
reboot after show flight mode why

:confused: