Short review: I would rather have paid more and had less hassle. The controller is fine.
Long review: The website has an AI chatbox. Had THREE conversations for red flashing home button.
Per Chatbox convo no. 2, download the app for firmware update, chatbox was pleasant but ended itself early.
*GameSir has THREE APPS on Microsoft App Store. Nexus, Connect and T4P(?)
Chatbox Convo 3, none of the 3 APPs are for this controller. Website chatbox provided linkS resulting in ERROR: www.bigeyes.com sent an invalid response. ERR_SSL_PROTOCOL_ERROR.
*There is no GameSir World APP available on Microsoft APP Store at the time of this review. Chatbox advised engineer issue and provided an email address.
I had a few minutes to play that resulted in a WORKOUT of a Manual Firmware Update. There are instructions in English and screenshots are provided. This needs your complete and careful ATTENTION, if you are not familiar with Chinese (or Japanese?) language in the screenshots.