D821 Repair Wi-Fi question

Hello!

I am trying to fix Wi-Fi on D821. Below is the log:
--------------------------------------------------------------------------------
Checking data...OK
Platform: LG Qualcomm
Selected port: COM35
Selected model: D821
Reading info...OK
Mode: Fastboot
Model ID: hammerhead D821(E) 16GB
Device serial number: 06505ab00b353adf
Hardware: rev_11
Bootloader lock state: unlocked
Fixing Wi-Fi MAC address...
New Wi-Fi MAC address: 00:02:4E:3F:5E:11
Reading partitions...
Initializing flash...Failed!Failed!
Performed by 2.8.6 Software version.
------------------------------------

Does it mean flash is corrupted or I have to try these operations in Emergency mode?