Originally Posted by Meridian
A similar firmware update is also available for the 40th Anniversary version of the DSP8000. To avoid the possibility of inappropriate firmware being loaded into other loudspeakers, this firmware is available only from Meridian support
This is the info Meridian has given their premium dealers when it comes to Anniversary DSP8000 firmware.
So contact your Premium dealer.

PerS

40th.Anv.DSP8000SE &861v8/ID41,Meridian Ultra Dac,C15 Black w/SSD,QNAP TS-669Pro 6X3 Tb w/Core,HD621,Oppo UDP-203 ,JVC DLA-X700R, 2xJL Audio F112v2, Marantz 8802A for Atmos with KEF Reference 5 and 4C withR700 sides & rears and 4xKEF R50 Atmos