The parameters only determine whether the TFTP server will cache firmware binary files, locale files, and constant files such as ringlist.xml and config xml files at startup. There's no need to worry if you change this parameter.
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Another option is to try just restarting the TFTP process. This will rebuild all the configuration files for the phones. This shoud only take a few minutes. During this time, phones won't be able to boot, but booted, working phones will function normally.
I test the upgrade in our lab with 2 Cisco 6941 Phones and a WAN Simulator . In this test it looks like we hinting the knowing bug. If we upgrade from Software 9-1-1-1 to 9-2-2-6-Sr1 and use the wan simulator settings ( delay 80 ms 2 Mbit 1 % error ) the upgrade hung .The upgrade from 9-2-2-6-Sr1 to a higher software version works without any problems ( the same WAN settings ) . Now we use the local router as TFTP Server to upgrade all the phones to the software 9-2-2-6-ES1. This works fine.....
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