The way to restore this is a qualcomm tool, but you also need a properly formatted and signed package to flash using the tool, and i doubt that google would give it to you.
I don't know how it is now, but my almost-decade-old generic Mediatek Android smartphone (still working, although seldom used) lets you access the whole eMMC in a special recovery mode using SPFlashTool, and there's no signing required. Looks like they have locked down things since then, ostensibly for security but more likely for corporate control and planned obolescence...
I don't know how it is now, but my almost-decade-old generic Mediatek Android smartphone (still working, although seldom used) lets you access the whole eMMC in a special recovery mode using SPFlashTool, and there's no signing required. Looks like they have locked down things since then, ostensibly for security but more likely for corporate control and planned obolescence...