: While still holding Resume, press and hold the Power button .
The Canon Service Tool (versions v3400–v5103) is a third-party utility designed to reset the "Waste Ink Tank Full" error (5B00) on the PIXMA MG2540S, which requires first placing the printer into Service Mode. While used to bypass this error, it is recommended to physically address the waste ink absorbers to prevent leakage, according to guides from prinfix.ru and es.scribd.com . Canon Service Tool V3400 Download Guide | PDF - Scribd canon mg2540s service tool