The latest BV9500 stock rom for May 2019 does not seem to be available at Mega with link provided. Could you either re upload the file to that location or post a new link to the file
https://mega.nz/#!qfgCQSZS!Ghw6P_XjGKA_ ... 8xutLHn5pc
2019051717_32v63c2k_jk.zip