In 2008, HP modified the design to use an Atmel AT91SAM7L128 processor with ARM7TDMI core running a software emulator of the previous Nut processor, written by Cyrille de Brébisson, in order to execute an image of the former Nut-based firmware in it. This has brought advanced possibilities such as flashing new firmware, not previously possible. HP also released a software development kit (SDK), making it possible to make new and custom operating systems. The calculator ran 60-90 times faster on most benchmark operations. This version (F2230A) was colloquially known as the ""HP-12C+"", although HP did not market it as a different product. In contrast to the preceding revision, it supported two parallel CR2032 cells, of which only one was necessary to run the calculator.