Constant libremarkable::framebuffer::common::MXCFB_SEND_UPDATE

pub const MXCFB_SEND_UPDATE: NativeWidthType = _; // 1_078_478_382u64

Should be 0x4048462e. This is not the ordinary value which is used in most software. Even the official toolchain(s). See: https://github.com/canselcik/libremarkable/wiki/Framebuffer-Overview