If you want → Get the 5.0707 RPKG via NaviFirm+ for your exact RM code. If you want custom features (e.g., increased RAM, 64MB pagepool) → Look for CODeRUS "N70 Refresh" but be ready to use JAF to repack as RPKG.
: Sites like firmware.center host direct downloads for various RM-84 firmware versions. nokia n70 rom rpkg best