Ok I managed to download the 3.2 version ROM from the Polish site
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I took me some 20 times before I had a complete copy.
I copied it to the SD card and did the upgrade as instructed on the web site last night and at first the phone did not start and seemed to be in a boot loop where, like, it is installing all the apks and when they are installed it starts all over installing the apks again.
Yesterday there was no notice about not to use the update on Chinese phones, and even if there had been I would have still tried it as I very much doubt that there is any difference between the Chinese and EU version Innos D6000.
Anyway after about an hour or so things sorted itself out and the phone started like a new one, asking the usual questions.
I can now report that all is working OK and it definitely looks like it is Android 6.0.1.
I can also report that I had the random reboots when I was using a Tracker apk that uses the GPS, on all previous ROMs (2.4, 2.6, 3.0, 3.3, etc.)
The phone has now had the tracker going for over 10 hours on the new ROM and no reboot, looking good.
I also noticed yesterday that my internal battery had stated to swell up, looking closely it appeared that it was a build up of gas of some kind, as the battery was/is performing well I decided that it would not hurt to let the pressurised gas out, as the main use of the plastic envelope is to exclude moisture from the Lithium inside. All I did was take off the back cover, peel back the large sticky label about 25%, when you do this the plastic envelope sealing the battery pulls a little away from the actual battery underneath, so with a sharp needle I punctured the plastic bag (careful not to hit the battery components underneath), pushed out the air/gas and stuck the label back on the battery, sealing the envelope again, result is no more swollen battery and battery still performing normal.
It looks that I now have got a phone that is sorted, pity that they are shutting down the GSM network in Australia (Telstra last week, Optus next April and Vodaphone next September) making this phone into a single SIM phone.
Looks like I might be up for an Xiaomi Redmi Note 4 in the new year.
Regards,
Martin