SP Flashtool on HTC Desire 526G dual sim

I know I should have unlock the bootloader first of my "HTC Desire 526G dual sim" but I accidentally flash TWRP recovery image in my phone by app called "Flashify". After a reboot the phone was struck on boot loop. Only fastboot mode was working. Than I try to flash stock recovery from "adb" and "fastboot". But unexpectedly, the fastboot mode also stopped. Than I try to flash the stock ROM from SP Flash Tool. I have already installed MTK6582 drivers on windows disabling driver signature enforcement in Windows 10. There occured two errors when I click download icon on SP Flash Tool and connect the phone to PC with or without battery
Sometimes following error occur:
Error 1013

Message: BROM ERROR:S_COM_PORT_OPEN Fail(1013)

Sometime this:
Error 2004

Message: BROM ERROR : S_FT_DOWNLOAD_FAIL (2004)
Than I googled the errors. Than found solution like this:
* Take out and reinsert the battery
* Try using a different USB cord, port and PC
* Right-click flash_tool.exe > Select Properties > Select Compatibility > Set to Windows XP Service Pack 3 > Click Apply > Click OK > Run SP flash tool as Administrator
* Try a different USB cord or port
* Ensure the battery is well changed and inside the switched off phone before connecting to PC for flashing
* Ensure the phone is switched off with battery inside before connecting to the PC for flashing

I tried all of that but the same error is recurring.
At this condition what can I do? How can I repair my phone.

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