Lordbyte i'm stupid windows user and I have never used linux 
but i used filezilla to connect to tv ftp and i see that "/mtd_rwcommon" have 755 rwx
i think that i need to do 777 rwx on folder "/mtd_rwcommon" yes ?
edit:
netcat:
i do 777 rwx on "/mtd_rwcommon" and nothing changed
(23) --> cat /.version > /mtd_rwcommon/PVRDecoder.msg
(23) <-- "X12 0136" KERNEL MODULE VERSION : "0112.1126, DTV, X12, release, DEU_BRANCH" 
(23) --> df | grep -E "dev.*sd" | awk '{print ""X""$1"",""$2"",""$3,""$4,""$5""}' | sed 's/\/dev\///g' > /mtd_rwcommon/PVRDecoder.msg
(23) <-- sda1 976636192 18132280 958503912 2%
(23) --> df | grep -E "dev.*sd" | awk '{print ""X""$1"",""$2"",""$3,""$4,""$5""}' | sed 's/\/dev\///g' > /mtd_rwcommon/PVRDecoder.msg
(23) <-- sda1 976636192 18132280 958503912 2%
(23) --> /mtd_rwcommon/samyGOso -p $(pidof exeTV || pidof exeDSP) -l /mtd_rwcommon/libPVRdumpkeys.so
(23) <-- 
(23) --> df | grep -E "dev.*sd" | awk '{print ""X""$1"",""$2"",""$3,""$4,""$5""}' | sed 's/\/dev\///g' > /mtd_rwcommon/PVRDecoder.msg
(23) <-- sda1 976636192 18132280 958503912 2%
(23) --> /mtd_rwcommon/samyGOso -p $(pidof exeTV || pidof exeDSP) -l /mtd_rwcommon/libPVRdumpkeys.so
(23) <-- 
(23) --> df | grep -E "dev.*sd" | awk '{print ""X""$1"",""$2"",""$3,""$4,""$5""}' | sed 's/\/dev\///g' > /mtd_rwcommon/PVRDecoder.msg
(23) <-- sda1 976636192 18132280 958503912 2%
(23) --> df | grep -E "dev.*sd" | awk '{print ""X""$1"",""$2"",""$3,""$4,""$5""}' | sed 's/\/dev\///g' > /mtd_rwcommon/PVRDecoder.msg
(23) <-- sda1 976636192 18132280 958503912 2%
samyGOPVRDecoder.log:
Scanning for TV .. Please wait.
 Querying recordings on TV ...
 All recordings on USB listed. Waiting for user..
 No keys found. Nothing to delete..
 Uploading / Executing Keydropper ..
 
 Dropping DRMDecrypt to work-folder.
 Uploading / Executing KeyDropper .. ..
 Retrieving 20131225125306.key from TV.
 Retrieving 20131225125306.inf from TV.
 Retrieving 20131225125306.srf from TV.
 Retrieved 108,12 Mb of 108,12 Mb ..
 DRMDecrypt job:  20131225125306.srf --> 2013122513h53Polsat2.ts
 ===============================================================================
    SamyGO - Samsung LED TV PVR Recording Decrypt (Denny@samygo)
    auto AF decryption, LFS, hw aes, unicode (bugficks@samygo)
    v1.2.3
 Error: open key file size 'C:\Temp\20131225125306.key'.
======================
    SamyGO - Samsung LED TV PVR Recording Decrypt (Denny@samygo)
    auto AF decryption, LFS, hw aes, unicode (bugficks@samygo)
    v1.2.3