The invention introduces a method for handling sudden power off recovery, performed by a processing unit of an electronic apparatus, to include: driving a flash interface to program data sent by a host into pseudo single-level cell (pSLC) blocks of multiple logical unit numbers (LUNs) in a single-level cell (SLC) mode with multiple channels after detecting that the electronic apparatus has suffered a sudden power off (SPO), and driving the flash interface to erase memory cells of all the pSLC blocks when data of all pSLC blocks has been read by the host. The pSLC blocks are reserved from being written to in regular operations until the SPO is detected.