Spanish manual on unlocking, releasing and flashing mobile phones, a 3.27 MB PDF. No brand, model or tool is named in the title, so expect general procedures covering network unlocking, firmware flashing and possibly the boxes or software used for them. It works as background reading for a software-side repair technician. Before flashing any handset, back up user data and calibration partitions where possible, use firmware made for the exact model and region, and follow local law regarding unlocking, since older methods may no longer apply to current devices.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @canalesquematicos. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.