Archive for the Samsung A032F (Galaxy A03 Core) at bootloader revision U4, noting a 1 GB size, packed as a 309 MB 7z. The 1GB tag most likely means a 1 GB memory image covering the boot and system-critical partitions, used for dead-boot recovery. Write it with an eMMC box such as Easy JTAG or UFI through ISP or a socket. The phone's binary revision must be U4 since Samsung blocks rollback. Read and keep the original chip contents before writing to preserve EFS and IMEI data.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @wzcare. Enginerys does not host this file.
How to open a .7z file
High-ratio compressed archive, often used for large BIOS collections.
7-ZipWinRARKeka (macOS)