Note: A write updates modified tables and takes under a minute. A Full OS Write rewrites the entire operating system and takes longer, carrying slightly higher risk.
An LS1 flash tool consists of hardware and software used to communicate with the GM Powertrain Control Module (PCM). For LS1 engines (typically manufactured between 1997 and 2004), the PCM relies on a 512KB or 1MB flash memory chip. ls1 flash tool