Yes, it is strange to read it, but the developer community has decided to keep every chink open for the OnePlus older. Let's talk today about OnePlus 3 and OnePlus 3T, the old glories of the brand that were born four and more years ago. It is known that the company carried on by Pete Lau has created many followers and loyalties. These not only support the brand, but also create support for all users who have no intention of letting their device go to waste. Let's see here the HavocOS custom ROM based on Android 11 and developed ad hoc for the two devices mentioned above.
HavocOS brings Android 11 to OnePlus 3 and OnePlus 3T: old guards never die, even if support is unofficial
Clearly, the official support for OnePlus 3 and OnePlus 3T has long since ended, it is one ROM custom unofficial. Having said that, however, there are no problems of conflicts or anything else as it is easily installed on your smartphone. Is called HavocOS and is currently the first and only ROM that brings Android 11 to these devices.
Read also: OxygenOS 11 Beta 2 based on Android 11 is now available for OnePlus 8 / 8Pro | Download
OnePlus 3 and its T version are not the only ones to have used HavocOS. Before them too OnePlus 7 and 7T they did and the reviews speak for themselves: no problem. Of course, the hardware of OP 3 and 3T is not exactly recent, but the bad can be turned back. The peculiarities of HavocOS are the customizations that many other custom ROMs they do not have. It is however based on Android Open Source Project (AOSP) and therefore offers, basically, a stock but steroid-filled experience. Without doubt it is among the most stable on the square. In short, it is worth trying to revive your smartphone.