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or 6225 CPUs (need to look for documentation): --- MT6225BA CECT V8 TianShiDa TS822 --- MT6225/6225A CECT 388 CECT 98 CECT 2618 CECT N95i ChangHong 868 ChuangWei T508 DaXian X889 DaXian X769 GaoXinQi D808 Hantai HT622 Hantai HT6868 JingLi H9 (some H9 also have MT6226) JinPeng A918 JinPeng 858 JinPeng A9 JinPeng S3506 JinPeng 2298 JinPeng L818 JinPeng A608 TianYu D170 TianYu B898 TianYu A930 TianYu B926 TianYu A908 ZTC 6988 ZTC 598 ZTC 1118 ZTE ZTLV900 ZTE ZT688 (note MT6205 versions also exist) --- MT6223PA TianYu B5010 CECT D1088 Next steps for me: Scan the schematics stuff and put it online. Find some 6223/6225 based phones that are cheap & suitable for hacking, i.e. ideally with some nice test points or JTAG. Other common MTK chips are 6205, 6217, 6218, 6219, 6226, 6228. One word of caution - the above lists, and documentation we start digging up, may give a false impression of predictability. In reality the brand names and model numbers are a total mess in China. Typos everywhere. All sorts of things are printed on cases & boxes, chips are changed without anybody noticing or caring. There are endless smaller Chinese brands making phones with 6223 or 6225 chips, but I think it will be very hard to use them as a stable source, to get phones with the same chips over time. So I think it's better to focus on the somewhat bigger Chinese brands as listed above. Wolfgang