شرح داونغرايد على دونغل البيست = BB5 SL3 Downgrade

Here is simple instruction how-to downgrade new SL3 phones via Erase method
Also this will be useful for repair phone - like - full SW rebuild ( Erase )

Platforms
By ONLY USB cable can be done with
RAPU11 - 6700, E52,E72, 5630, C5, N8, C7, C6-01, C3-01, X3-02, C5-03, E7, E6, E5, X7, T7 and others.
RAPU21 - X3-02, C3-01, 500, 600, 700, 701 and others ...

By FBUS ( RPL BACKUP via JAF box as interface ) + all other via USB can be done with
RAPIDO - 5530,N97,5800,C6,5250,5230,X6,E71,E75 and others
FBUS needed only for RPL backup (NPC/CCC/HWC sections). Erase, Flash, Repair - possible by USB cable only.

By FBUS ( Log reading ) + all other via USB can be done with
RAPV4 - X3, 3710, 6303i, 7230 and same ...
FBUS needed only for log read (for security repair operations). RPL backup, Erase, Flash, Repair - possible by USB cable only.

By FBUS can be done with
RAP3G phones - 6303c, 5130 and same ...
OLD RAPIDO phones - 5800, N81 and same ...
OLD RAPU11 phones - 6700, E52, E72 and same ...

Example with RAPU21 phone - Nokia 500 (RM-750)
Phone version before : 010.31
Needed version to flash : 010.29
Using USB cable.

Actions

1st step : RPL backup, PM backup, PP backup

2nd step : Erase FLASH

3rd step : Flash needed FW version

4th step : RPL restore

5th step : Repair SDD if needed, do Local SX4 + Upload PM

6th step : Factory sets, edit production data, run phone

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For BACKUP RPL from DEAD phones can be used this way

1st step : Backup NPC (it very important - by USB - RAPU11, RAPU21, RAP4, BCM, or Fbus - RAPIDO, RAP3... )
2nd step : Erase NPC ( Erase mode - select NPC/CCC/HWC )
- If local exist - do READ PM , READ RPL. SIMLOCK SAVED - It is critical part. Now can be done Erase and anything else.
- If no Local exist - Flash LATEST WS version, ENO. If local will be - READ PM, READ RPL. SIMLOCK SAVED - It is critical part. Now can be done Erase and anything else.
- If still no local - better digg HW first.

When we will have NPC and Simlock (or full PM, or only PM120) backups - we can forget about RPL buy and do on SW whatever we want