Yes! Without a properly completed Borang 2, your postal vote will be null and void. So please make sure you can get another Malaysian adult to act as your witness. The Global Bersih team has appealed to the Election Commission (SPR) to remove such an onerous requirement, but as of now – the requirement remains.
For this coming 6PRN, you can contact Vote Malaysia to returned your ballot paper to Malaysia:
VoteMalaysia main: https://t.me/votemalaysia
VoteMalaysia UKE: https://t.me/VoteMalaysiaUKE
VoteMalaysia Singapore (1ThirdMedia): https://t.me/UndiPosSGX1Thirdmedia