JVC 250 Service Manual page 170

11B. From the Windows Terminal Menu (normally in Accessories window),
select "Transfers/Send Text File", then select "List Files of Type: All
Files", and select the disk and/or directory with the Model 250 software.
You should see a file named "boot.hex". Select this file and press the OK
button to begin the upload. Uploading takes about 20 minutes (9600 bps).
11C. During upload, a progress indicator updates the number of records
received. At the completion of the upload, the system will display the
following (numerical values are for example only and depend on the
Boot Manager version):
11D. The system has verified that the load module is correct and is ready to
update the Flash. Press Enter to perform the update (press Esc now to
abort the update with no changes). While the Flash memory is being
updated (15-30 seconds), DO NOT turn off the projector circuit breaker
or the machine could be made unbootable, requiring a new set of flash
chips to be installed. When the update is complete, the system will
display the following:
The Boot software has been successfully updated. To restart the projector
under control of the updated boot manager, enter the "reboot" command
while depressing the service mode switch (see Figure 7-1). The projector
will now restart with the updated boot manager software.
NOTE: If normal software starts, see Step 9 to reenter Boot Manager.)
You should see the following displayed, where y.y.0 is the updated Boot
Manager's version.
Model 250 Service Manual
***WARNING: IMPROPER USE MAY MAKE THIS SYSTEM
UNBOOTABLE*** (This warning relates to the
Flash Memory
11D. Do not turn projector power off while the
Flash Memory is updating)
Memory buffer reset to 0xff
Begin your S-Record upload now (Esc to abort).
S-Records processed: 823
Upload Successful
Address Range: 0x00000000-0x00006687
Bytes Loaded: 26248
***WARNING: FLASH WILL NOW BE UPDATED***
Press Enter to continue, Esc to abort.
Reprogramming Flash Sector 0 1
Boot Manager software update successful
Command: _
Chapter 8---Software and Protocol
updating that occurs in Step
8-3