even does realise that it can only be installed for consoles which have 3.55 CFW not 4.21 OFW? It says here in chinese
"得到RED POWER的人员回复——系统只能在3.55刷，刷机风险与3.55升级到官方4.21相同。硬降机可刷" :
English Translation: "We received word from a member of the RED POWER team stating that this CFW can only be install on machines with 3.55 CFW. Also consoles on DEX firmwares will also be able to install this firmware as well"
The guy shows proof that hes on a 4.21 console and that its not 3.55. Future developments can be found in the below thread: bbs.duowan.com/thread-28966253-1-1.html