[Umbabaraumba]

I successfully downgrade RM-217 6300 v5.50 with v5.00 for unlock.I tryed many times with RJ45 F-BUS cable - I attach cable to 10 -> 8 pin MT-BOX adaptor,but not success. I disconect 10 -> 8 adaptor and connect MT-PRO to MT-BOX,connect RJ45 F-BUS cable to MT-PRO,start MT software,press POWER button on phone and phone is in LOCAL MODE - MT-PRO green light is ON !!! Phone successfully downgrade to v5.00 and unlock is OK!! This is log file:

Phone is in: Local mode
Model: RM-217 ( 6300)
V 05.50/14-08-07/RM-217 (c) Nokia.
Production serial number KER871932
Product code 0515919
Module code 0203166
Basic production code 0537040
Flash code
Order number
Long production SN
MCU SW V 05.50/14-08-07/RM-217/(c) Nokia.
HW 3007
PCI
RFIC 17211721
DSP 06w14pb_07w32
PPM V 05.50/14-08-07/RM-217/(c) Nokia. /C
Retu 32
Tahvo 53
Content Pack Content: o2_pre_uk/V 05.50/14-08-07/RM-217/(c) Nokia. //
IMEI: 359809013168316
WARNING: VPP pin is not connected, disabling VPP.
V 05.50/14-08-07/RM-217 (c) Nokia.
IMEI: 359809013168316
Operator: 8000000000000000
Profile bits: 2341000000000000
Closed on Mcc Mnc: 23410F
Counters 0/10, 0/3

BB5 Downgrade - - - - - - - - - - -
VBat is 3.96V

Vpp pin has 0.09V, Not Connected
Pins:
Mbus 1, Box Tx 1, Box Rx 1, Bsi 0
Phone is in: Local mode
Found record. Clearing and sending to phone..
============== Staring flash procedure =================
VPP is DISABLED.
BB5 PM back Phone is in: Local mode
IMEI: 359809013168316
Backup file: C:\Program Files\GriffinTeam\MT-Box\bb5bckup\RM-217_359809013168316.pm
Processing File: rm217__05.00.mcusw
Boot...
rap3gv3_2nd.fg
RAP3Gv3_algo.fg
NPC 0x180
HWC 0x100
CCC 0x180
Backup: \GSM_35980901316831.r3c
Erase RAP3 [00000000 - 000006BF]
Erase RAP3 [000006C0 - 0001FFFF]
Erase RAP3 [00020000 - 0007FFFF]
Erase RAP3 [00080000 - 000DFFFF]
Erase RAP3 [00100000 - 001FFFFF]
Erase RAP3 [00200000 - 0031FFFF]
Erase RAP3 [00320000 - 0105FFFF]
Erase RAP3 [01060000 - 01067FFF]
Erase RAP3 [01068000 - 0107FFFF]
Erase[16.38 MB]...
Waiting response for 320 Sec...in 42.38s
Flash[14.38 MB]...in 436.28s
* * Processed file in 489.64 seconds
Processing File: rm217__05.00.image_i
Low level format...OK
Content area page size is 128K.
Boot...
rap3gv3_2nd.fg
RAP3Gv3_algo.fg
Erase RAP3 [01600000 - 01FDFFFF]
Erase[9.88 MB]...
Waiting response for 320 Sec...in 28.09s
Flash[3.00 MB]...in 89.86s
* * Processed file in 172.38 seconds
Extract content...OK
Processing File: rm217__05.00.ppm_i
Boot...
rap3gv3_2nd.fg
RAP3Gv3_algo.fg
Erase RAP3 [01080000 - 015FFFFF]
Erase[5.50 MB]...
Waiting response for 320 Sec...in 13.06s
Flash[4.28 MB]...in 136.52s
* * Processed file in 157.55 seconds
* * * Phone flashing done in 14: 7 minutes
Post Flash serial tunning of phone....
Pooling mode for full factory set...
V 05.00/27-04-07/RM-217 (c) Nokia.
IMEI: 359809013168316
Factory Default Settings...OK
Reset user code...Successfull, code is 12345


F 05.00/27-04-07/RM-217/(c) Nokia.
Auto backup SIMLOCK...
=================================
bb5bckup\359809013168316.pm
nBackup file already exists! SKIPPING backup
=================================
===================================
V 05.00/27-04-07/RM-217 (c) Nokia.
IMEI: 359809013168316
Operator: 8000000000000000
Profile bits: 2341000000000000
Closed on Mcc Mnc: 23410F
===================================
Using Account: uMTPlite101020
Connect...
Resp:
o/0110/hello there
Login...
OK, available count
40;
busy, waiting...
Server Response OK.
===================================
Connect TPs
V 05.00/27-04-07/RM-217 (c) Nokia.
IMEI: 359809013168316
V 05.00/27-04-07/RM-217 (c) Nokia.
IMEI: 359809013168316
V 05.00/27-04-07/RM-217 (c) Nokia.
IMEI: 359809013168316
V 05.00/27-04-07/RM-217 (c) Nokia.
IMEI: 359809013168316
V 05.00/27-04-07/RM-217 (c) Nokia.
IMEI: 359809013168316
V 05.00/27-04-07/RM-217 (c) Nokia.
IMEI: 359809013168316
TPs OK
UNLOCK SUCCESSFULL
SUCCESSFULL
V 05.00/27-04-07/RM-217 (c) Nokia.
IMEI: 359809013168316
Operator: 8000000000000000
Profile bits: 2341000000000000
Open on Mcc Mnc: 23410F
Sim Status: Not locked

This method work 1000%.Please test and post result!!!