Hi Simon,
Firstly Thanks for your downgrade script i have had to modify it for my model tv: HE_DTV_W15A_AFADABAA. I have created a new answer file with the location to the epk downgrade. when i hit the update > install i get an error "Update failed due to decrypting data error".
I have tried the online CDNs and my own local copy's
http://su.lge.com:80/GlobalSWDownloadCdn.laf?IMG=/201506/starfish-dvb-secured-h15-41.badlands.h15-4133-03.03.45-prodkey_nsu_V3_SECURED.epk
http://192.168.1.65/LG_DTV/starfish-dvb-secured-lm15u-badlands-453201-03.03.06-prodkey_usb_V3_SECURED.epk
Same error for each and or other versions
Model: 65UF850V-ZB
in_dump.txt
<REQUEST>
<PRODUCT_NM>webOSTV 2.0</PRODUCT_NM>
<MODEL_NM>HE_DTV_W15A_AFADABAA</MODEL_NM>
<SW_TYPE>FIRMWARE</SW_TYPE>
<MAJOR_VER>02</MAJOR_VER>
<MINOR_VER>06.03</MINOR_VER>
<COUNTRY>GB</COUNTRY>
<DEVICE_ID>XXXX</DEVICE_ID>
<AUTH_FLAG>N</AUTH_FLAG>
<IGNORE_DISABLE>N</IGNORE_DISABLE>
<ECO_INFO>01</ECO_INFO>
<CONFIG_KEY>00</CONFIG_KEY>
<LANGUAGE_CODE>en-GB</LANGUAGE_CODE></REQUEST>
answer file: HE_DTV_W15A_AFADABAA
<RESPONSE><RESULT_CD>900</RESULT_CD><MSG>Success</MSG><REQ_ID>00000000002517882427</REQ_ID><IMAGE_URL>http://snu.lge.com/SWDownload.laf</IMAGE_URL><IMAGE_SIZE>699098426</IMAGE_SIZE><IMAGE_NAME>starfish-dvb-secured-lm15u-badlands-453201-03.03.06-prodkey_usb_V3_SECURED.epk</IMAGE_NAME><UPDATE_MAJOR_VER>03</UPDATE_MAJOR_VER><UPDATE_MINOR_VER>03.06</UPDATE_MINOR_VER><FORCE_FLAG>Y</FORCE_FLAG><KE></KE><GMT>10Jun 2015 19:19:18 GMT</GMT><ECO_INFO>01</ECO_INFO><CDN_URL>http://192.168.1.65/LG_DTV/starfish-dvb-secured-lm15u-badlands-453201-03.03.06-prodkey_usb_V3_SECURED.epk</CDN_URL><CONTENTS></CONTENTS></RESPONSE>