[Windows Phone 8 Q&A, Help & Troubleshooting] Antonio Almeida Filho:
Guys, I'm having trouble with my Lumia 820. I was trying to install the engineering ffu forcibly with WP Internals. I dumped the MainOS and EFIESP partitions, compress and installed as custom ROM. I managed to install, but has problem that was missing files in Windows/system32/DRIVERS. I tried to reinstall the original ffu and WP Internals told me to choose an appropriate ffu for the device. I tried to use the Nokia Care Suit and is giving an error of the same type. I tried using the Windows Device Recovery Tool and is asking to return the screen 'wellcome'. Can someone help me?

Edit: I'm on red screen now, but problems still

Edit 2: I get the device info whith thor2

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Read FlashApp Build Info
Read parameter from UEFI Flash App
Read parameter Ok
FlashApp Build Info: Date:Jun 13 2014 Time:09:59:11 Info:-

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Read final config
Read parameter from UEFI Flash App
Read parameter Ok
Final config status: 0x00007FFF
SECURE_BOOT enabled
FFU_VERIFY enabled
JTAG enabled
SHK enabled
SIMLOCK enabled
PRODUCTION_DONE enabled
RKH enabled
PUBLIC_ID enabled
DAK enabled
SEC_GEN enabled
OEM_ID enabled
FAST_BOOT enabled
SPDM_SEC_MODE enabled
RPM_WDOG enabled
SSM enabled

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Get Device status
Transfer size: 2363392
Buffer size: 2359296
Number of sectors: 15269888
PlatformInfo is Nokia.MSM8960.P5174.3.2.1
Async protocol version: 01
Security info sublock detected
Platform secure boot enabled
Secure FFU enabled
JTAG eFuse blown
RnD Certificate not found
Authentication not done
UEFI secure boot enabled
SHK enabled
Device supports FFU protocols: 0031

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Read charging status
Read parameter from UEFI Flash App
Read parameter Ok
State of charge: 11 %. Charging current: 223 mA (discharging)

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Read public ID
Read parameter from UEFI Flash App
Read parameter Ok
Public ID is 3B7BF6A7A4212271CCDEBF6FEDECC1F5FE2FB7FA

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Read UEFI Secure Boot Info
Read parameter from UEFI Flash App
Read parameter Ok
-- UEFI Secure Boot Info --
The state of public Platform Key (PK) UEFI variable:
Production
The state of Key Exchange Key Signature Database (KEK) UEFI variable:
Unknown
The state of Signature Database (db) UEFI variable:
Unknown
The state of Forbidden Certificates Database (dbx) UEFI variable:
Unknown
The state of Secure Boot Policy (CurrentPolicy) UEFI variable:
Unknown

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Read Root Key Hash
Read parameter from UEFI Flash App
Read parameter Ok
Root Key Hash is DB73418E5840941CE7BD35949085B8F74628D511F19285A092ED3B600A64CC29

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Starting to read Phone Info
Detecting UEFI responder
Send HELLO
HELLO success
Lumia Flash App detected
Disable time-outs
Read FlashApp Build Info
Read parameter from UEFI Flash App
Read parameter Ok
FlashApp Build Info: Date:Jun 13 2014 Time:09:59:11 Info:-
Transfer size: 2363392
Buffer size: 2359296
Number of sectors: 15269888
PlatformInfo is Nokia.MSM8960.P5174.3.2.1
Async protocol version: 01
Security info sublock detected
Platform secure boot enabled
Secure FFU enabled
JTAG eFuse blown
RnD Certificate not found
Authentication not done
UEFI secure boot enabled
SHK enabled
Device supports FFU protocols: 0031
Read Root Key Hash
Read parameter from UEFI Flash App
Read parameter Ok
Root Key Hash is DB73418E5840941CE7BD35949085B8F74628D511F19285A092ED3B600A64CC29
Read public ID
Read parameter from UEFI Flash App
Read parameter Ok
Public ID is 3B7BF6A7A4212271CCDEBF6FEDECC1F5FE2FB7FA
Protocol version 1.18 Implementation version 2.2
Booting to PiApp
Reboot to PiApp command sent successfully.
Waiting for matching re-connection of device.
Device is online
Detecting UEFI responder
Send HELLO
HELLO success
Lumia Phone Info detected
Disable time-outs
Protocol version 1.1 Implementation version 1.3
Read Phone Info
Phone Info:
Version: 1.1.1.3
TYPE: RM-825
LPSN: MOM158832
HWID: 2452
CTR: 059Q8H4
MC: 0205607
IMEI: 355941053163313

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Edit 3: I'm getting this error when trying to install partition by partition:

View attachment 3900751

Edit 4: I'm having trouble with the signature that is on my phone. When I leave the check ffu and mobile subscriptions, I get the following error:

View attachment 3904003

Edit 5: When I try to unlock bootloader, I got this error:

View attachment 3904067

View attachment 3904068