How do I use a different payload?
Obtain a TI-84 Plus/Silver Edition AppVar containing the payload's data and transfer it to your calculator. (It can either be in RAM or you can archive it; it doesn't matter.)
Once on the calculator, specify you want the jailbreak to use that external payload (known as the "stage 1" payload) by going into the 5) Options menu and using [LEFT] and [RIGHT] arrows to select it, then choose "Save." These options are stored in an AppVar called "PS3JBOPT". It would be wise to archive this so you don't have to re-apply the options whenever your RAM resets.
How do I create one of these payload AppVars?
You can use the converter
to encapsulate a binary file of payload data in an AppVar variable for tansferring to your calculator. This is a command-line VB.NET 2.0 program; if you don't like it, create your own using the file format specification on ticalc.org.