Here’s a potential alternative to deleting: extroot. Grab your fastest USB stick that’ll work for the Beryl & check out this overview:
Be aware it’s not unheard of that a bad power spike could really ruin your day using such a config; specifically potential filesystem corruption from an unclean dismount of the drive/storage. It is a way of taking a small/nearly filled storage on a device to a much larger one, though (eg: Certa, GL-AR750, default 16MB onboard to 974MB on uSD) however… but do backup your current state before getting all ‘experimental:’