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Luka the burning you notice during removal of the cover glass is likely the epoxy glue used to seal the coverglass to the sensor body. Typically it starts to turn white in the area where heat is applied which indicates it has broken its bond. The application of heat to that glass, to break the glass loose, is a risky step but there is no other way to do it that i am aware of. A hot air workstation is sometimes sighted as the 'safe' way to do this, but many of us use small butane torches that can supply a pencil type flame. As some of the online videos show, its how you apply the heat that is critical; movement of the torch in 'passes' to get the initial white edge under the glass is important to avoid hot spotting that can damage the sensor fine wires which are soldered in place. Also the glass can break through uneven heat application to cold glass, so don't try to get under the glass with a tool or blade to lever it off. A cracked cover glass is much more problematic to remove without damaging the sensor surface or the wires. It only takes a small chip falling into the sensor surface area to cause damage.
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