Can the bootloader be unlocked if it is currently locked using any known methods? ....Even though the pixel 7a (Android 15) is currently FRP locked?
yes
connect phone fastboot mode
open cmd
write command
fastboot flashing unlock
Unlock the bootloader
Once in the bootloader mode, to unlock the bootloader and enable partitions to be reflashed, run the fastboot flashing unlock command on the device. After setting, the unlock mode persists across reboots.
Devices should deny the fastboot flashing unlock command unless the get_unlock_ability is set to 1. If set to 0, the user needs to boot to the home screen, open the
Settings > System > Developer options menu and enable the
OEM unlocking option (which sets the get_unlock_ability to 1). After setting, this mode persists across reboots and factory data resets.
When the fastboot flashing unlock command is sent, the device should prompt users to warn them that they might encounter problems with unofficial images. After the user acknowledges the warning, the device should perform a factory data reset to prevent unauthorized data access. The bootloader should reset the device even if it can't reformat it properly. Only after a reset can the persistent flag be set so that the device can be reflashed.
All RAM not already overwritten should be reset during the fastboot flashing unlock process. This measure prevents attacks that read leftover RAM contents from the previous boot. Similarly, unlocked devices should clear RAM at every boot (unless this creates an unacceptable delay), but should leave the region used for the kernel's