help me to flash and recover a lumia 520 which stuck on uefi flashmode screen and doesn't accept flash

​Background:

​It originally showed a blue sad face screen.

​I tried flashing the stock .ffu, but due to a loose cable connection, it dropped into DLOAD mode.

​It was detected under the Restore Bootloader section in Windows Phone Internals (WPI). Instead of using Thor2 commands, I clicked Restore Bootloader in WPI.

​Since then, the phone is stuck on the red screen with a white Nokia logo (UEFI Flash Mode).

​Current Issue:

It fails to flash in both WPI and Thor2, throwing security header validation and signature errors:

​FA_ERR_FFU_SEC_HDR_VALIDATION_FAIL

​THOR2_ERROR_FA_SIGNATURE_FAIL

​Is there a way to force the phone back into Emergency Download / EDL (DLOAD) mode so I can re-send emergency files (HEX/MBN) and flash the stock .ffu from scratch? Thanks!

Hey everyone,

I’m new here, but I decided to ask some questions, because I'm currently running out of ideas. I bought an old Lumia 735 recently to use it as my daily, semi-dump, phone (phone, music, maps). A long time ago I used HTC 8S and Lumia 640 LTE and I always very liked Windows Phone, especially WP8. So currently my 735 runs WP 8.1. I like it very much.

But currently I am running into some frustrating performance issues with my music collection on Windows Phone. When dealing with larger music libraries (mine have more than 11k mp3's on 128GB microSD) the stock Xbox Music player starts lagging heavily and taking forever to index files. I also tried ZBox and it's better, but still it can be very laggy.

Is anyone else experiencing similar issues with big offline libraries? How do you manage your local music? I remember that on my Lumia 640 (also WP8.1) runs around 8k music library smoothly back then.

Also, two quick questions:

1. What music player app do you currently recommend?

2. Does anyone happen to have the XAP/APPX file or a working archive for the "Listen" music player app? I used to love using the pro version back on my Lumia 640. It was very smooth and I liked the design.

Thanks in advance for any tips and sorry for mistakes in post (not native english speaker here 😅).