I offered to continue supporting owners of Zinwell products for as long as possible after the demise of the NZ distributor.  The ZMX7500 was designed in 2006 and was extensively used here in the trials prior to the launch of Freeview in 2007.   Manufacture of this model ceased at the end of 2009.   Although I still have contact with the manufacturer in Taiwan, the original software design team was an external contractor who didn't release the kernal source code to Zinwell.   As that company was disbanded  there is no possibility of any further software updates.   This model has been a solid and reliable work horse now for over 6 years.  How many people have kept and continued to use the same computer or cellphone for that length of time?   The original design concept was to have a simple to install receiver that was locked to the 2 Freeview transponders and at that time it was not envisaged that the receiver would ever need to tune to transponders other than 12483 & 12456.   I hope I have been able to provide the means for owners of this product to extend its useful life further.    Someone cleverer than me came up with the method for adding additional transponders and channels, despite the locked down software and I have tried to make the procedure as easy as I can to understand for the non-technical.   I have refined the instructions several times from the feedback I have had from continuous emails and phone calls I have received since the 8th of October.    I have been able to talk all callers through the parts where they have had difficulty and to date there has been only one person I couldn't help because of a suspected faulty LNB.   Today I even talked an elderly gentleman thru changing the LNB frequency to compensate for an aging LNB which had caused the loss of all channels, of cause advising him that he would probably need to have it replaced in the near future.