The "part2.rar" suggests the total firmware file was split into multiple parts (likely due to file size limits on hosting sites like MediaFire or Mega). Where to Find the Firmware
A popular site for China-made LED TV software. Download M358 801 1366x768 512M Samsung part2 rar
Frequently hosts "Three-in-One" USB firmware for board numbers like M338 and M358. The "part2