The Samsung Galaxy S Plus GT-I9001 is the lesser known cousin of the original Galaxy S GT-I9000 smartphone.While virtually indistinguishable from the I9000 from the outside, the devices are vastly different on the inside: For starters, the I9001 swaps out the 1 GHz Hummingbird processor for a 1.4 GHz Snapdragon S2.
While the hardware received somewhat of an upgrade compared to the original Galaxy S, there is a bit less aftermarket development available for the S Plus. Now, however, a major gap has been crossed, thanks to XDA Recognized Developer educk and Senior Member h0rn3t. The developer was able to get dual boot functioning on the device.
Educk and horn3t’s solution comes in the form of an application and compatible kernel that is able to switch between your ROM installations once the ROMs are installed in the manner specified by the developer. There are, however, a few requirements and restrictions that must be met before getting up and running. For starters, the main ROM has to be an AOSP-derived ROM based on Android 2.3.6 or above. This is installed on internal storage. The secondary ROM is then installed on your SD-EXT partition, and it must be Android 4.1.2 or greater.
If you’ve wanted to experiment with a newer ROM but didn’t want to leave behind your old Gingerbread installation, now may be the time to do it. To get started, head over to the original thread.
[Many thanks to XDA Senior Member mrjraider for the tip!]_________