For bv9500plus any auto call recorder app recommended?

PTT buttom is design to expose before buttoms of volume up-down. With the weight of BV9500 plus (P70), if you place it horizontally (watching clip full screen etc), the message 'please install PTT application' will illuminate on the screen as long as you place horizontally..  Please find the way to ...

From the BV9500 plus ad, it said 7 hour on the 5V/2A normal charge. I am using Blackview pad (model:W1) and it was charged around 10% up in each hour. Then i can have fully charge in 10hour. Is this normal? Is this 10W fast charge or 5W standard charge? If i were not wrong, fast charge 3.5 ...

In case of calibation in BV9500 plus (P70), what is the code of calibation? *#*#33#*#*?

[font=-apple-system, Helvetica Neue, Helvetica, sans-serif]*#*#33#*#* didn't work for me.[/font]

Some bumper / cover to protect the rear camera of BV9500 plus found in the Rusian viewer.

May I ask on where to buy this piece?