you need this to get further updates
load it on a sd card or usb stick(don't unzip it)Code:https://mega.nz/file/OgpBBB4R#8CT5VzaLGa4jbzItM1kiEOaTlEmv-3-JrUIoYDO-8x0
select update firmware from external drive
https://youtu.be/9l1x3KJl_jE
it doesn't matter that video is for 4500 as it's the same for 4900