If the tool fails mid-process, you have no recourse. Genuine service centers have recovery procedures; pirate users do not.
Typing "software canon service tool v.4906 download gratis" into Google or YouTube yields thousands of links. Here is the reality of where those links lead:
To use the Canon Service Tool v.4906, the printer must first be placed into Service Mode manually. This typically involves a specific button-pressing sequence (usually involving the Stop/Reset and Power buttons) while the printer is powered off. Once in Service Mode, the printer is connected to a computer via USB, and the software is launched to detect the connected device.
Cybersecurity firms have analyzed cracked Canon Service Tools. Over 70% contain trojans, keyloggers, or coin miners. Because the tool requires administrator access to communicate with USB devices, malware can easily bypass security controls.