The Universal MicroCode (UMC) Loader is a bootloader that supports 16F(A) and 18F(K, J) series PIC microcontrollers. Full *.asm source code is provided, so it's very easy to roll your own loader solution. Don't worry if you feel uncomfortable using assembler - the UMC loader also includes a UMC Builder application, which automates the assembly process. Just edit "umcbuild.ini", like this

 ; source code files...
 [TEMPLATE]
 PIC16=..\src\16F\umc_loader.asm
 PIC18=..\src\18F\umc_loader.asm

 ; device name and OSC...
 [MCU]
 Device=18F452
 OSC=20000000

 ; device configuration settings...
 [CONFIG]
 config OSC = HS
 config PWRT = OFF
 config WDT = OFF
 config LVP = OFF
 config DEBUG = OFF

 ; optional user define control code 
 [USERCODE]

an then just double click "umcbuild.exe" - your loader file will then be automatically built and assembled.

Additional Information

Here is some additional information which you may find useful.

• User Configurations for USERCODE Section
• UMC Builder Documentation