Custom Resolution Utility is a utility, which allows users to modify their NVIDIA and AMD graphics cards by creating EDID overrides directly in the registry. The utility works based on computers and laptops with AMD and NVIDIA graphics cards, as well as on some Intel cards. Windows XP is not supported, but all others starting with Vista (7, 8.1 and 10) work properly. The program was updated on second of July in 2019 to version 1.4.1. The layout of the utility provides a list of currently supported resolutions for your monitor with the option to add new ones. Users use Custom Resolution Utility download and can run it without installation.
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plus video tutorial on youtube

that's the only thing i have not tried yet. i will report soon. thanks.

GPU-Z is unable to save the vBIOS on my laptop (Radeon HD 6630m; other specs in my signature), and so is ATI WinFlash. i'm assuming then that the video-BIOS is integrated into the system BIOS. in that case, how can one download/save/edit the vBIOS?