Yes. Look for “T3 P1 pre-rooted Magisk” on 4PDA. Custom ROMs often remove bloatware and add CPU governors.
Based on changelogs from various OEMs (like Transpeed, Vontar, or Hkvision), the Quad-core T3 P1 update typically addresses: Quad-core T3 P1 Update Download
This is a hard brick. You need to short the NAND pins (search “unbrick [your model] T3 P1 short pin”) or use Mask ROM mode in the burning tool. This requires advanced skills. Quad-core T3 P1 Update Download
No. Most T3 boards are capped at Android 10 or Android 11. Android 14 would require a new bootloader and kernel, which OEMs do not provide for legacy quad-core chips. Quad-core T3 P1 Update Download