C:\dist>avrdude -C avrdude.conf -c snap_updi -p avr16e
a28 -vv -U flash:w:flash.hex:a -U eeprom:w:eep.hex:a

avrdude main() warning: Linked C library does not conform to C99; avrdude may not work as expected

avrdude: Version 7.2-20240108 (5b3c313)
         Copyright the AVRDUDE authors;
         see https://github.com/avrdudes/avrdude/blob/main/AUTHORS

         System wide configuration file is C:\Users\user\Desktop\Jan7-2\dist\avr
dude.conf

         Using port            : usb
         Using programmer      : snap_updi
avrdude: jtag3_open_updi()
avrdude: HV UPDI support: 1
avrdude: found CMSIS-DAP compliant device, using EDBG protocol
avrdude: jtag3_edbg_prepare(): connection status 0x01
avrdude: sending sign-on command: 0x80 (3 bytes msg)
avrdude: input file flash.hex auto detected as Intel Hex
avrdude: input file eep.hex auto detected as Intel Hex
         AVR Part              : AVR16EA28
         Programming modes     : UPDI, SPM

         Memory            Size  Pg size    Offset
         -----------------------------------------
         eeprom             512        8    0x1400
         flash            16384       64  0x800000
         fuses               16        1    0x1050
         fuse0/wdtcfg         1        1    0x1050
         fuse1/bodcfg         1        1    0x1051
         fuse2/osccfg         1        1    0x1052
         fuse5/syscfg0        1        1    0x1055
         fuse6/syscfg1        1        1    0x1056
         fuse7/codesize       1        1    0x1057
         fuse8/bootsize       1        1    0x1058
         lock                 4        1    0x1040
         prodsig/sigrow     128      128    0x1100
         signature            3        1    0x1100
         tempsense            4        1    0x1104
         sernum              16        1    0x1110
         userrow/usersig     64       64    0x1080
         io                4160        1         0
         sram              2048        1    0x7800
         sib                 32        1         0

         Variants   Package  F max   T range         V range
         ----------------------------------------------------------
         AVR16EA28  SOIC28   20 MHz  [-40 C, 125 C]  [1.8 V, 5.5 V]

         Programmer Type       : JTAGICE3_UPDI
         Description           : MPLAB(R) SNAP in UPDI mode
avrdude: jtag3_getparm()
avrdude: sending get parameter (scope 0x01, section 0, parm 0) command: 0x84 (9
bytes msg)
         ICE HW version        : 1
         ICE FW version        : 1.10 (rel. 249)
         Serial number         : 
avrdude: jtag3_getparm()
avrdude: sending get parameter (scope 0x01, section 0, parm 1) command: 0x84 (6
bytes msg)
avrdude: jtag3_setparm()
avrdude: sending set parameter (scope 0x12, section 0, parm 0) command: 0x80 (3
bytes msg)
avrdude: jtag3_setparm()
avrdude: sending set parameter (scope 0x12, section 0, parm 1) command: 0x80 (3
bytes msg)
avrdude: jtag3_setparm()
avrdude: sending set parameter (scope 0x12, section 1, parm 0) command: 0x80 (3
bytes msg)
avrdude: jtag3_getparm()
avrdude: sending get parameter (scope 0x01, section 1, parm 0) command: 0x84 (6
bytes msg)
         Vtarget               : 0.59 V
avrdude: jtag3_getparm()
avrdude: sending get parameter (scope 0x12, section 1, parm 0) command: 0x84 (5
bytes msg)
avrdude: jtag3_getparm()
avrdude: sending get parameter (scope 0x12, section 0, parm 0) command: 0x84 (5
bytes msg)
avrdude: jtag3_getparm()
avrdude: sending get parameter (scope 0x12, section 1, parm 49) command: 0x84 (6
 bytes msg)
         PDI/UPDI clk          : 100 kHz

UPDI SET:
        xd->prog_base_msb=80
        xd->prog_base=0 0
        xd->flash_page_size_msb=0
        xd->flash_page_size=40
        xd->eeprom_page_size=8
        xd->nvmctrl=0 10
        xd->ocd=80 f
        xd->address_mode=1
avrdude: jtag3_setparm()
avrdude: sending set parameter (scope 0x12, section 2, parm 0) command: 0x80 (3
bytes msg)
avrdude: sending AVR sign-on command: 0xa0 (4 bytes msg)
avrdude: bad response to AVR sign-on command: 0xa0
avrdude: retrying with external reset applied
avrdude: sending AVR sign-on command: 0xa0 (4 bytes msg)
avrdude: bad response to AVR sign-on command: 0xa0
avrdude: retrying with external reset applied
avrdude main() error: initialization failed, rc=-1
        - double check the connections and try again
        - use -B to set lower the bit clock frequency, e.g. -B 125kHz
        - use -F to override this check
avrdude: jtag3_close()
avrdude: sending AVR sign-off command: 0x80 (3 bytes msg)
avrdude: sending sign-off command: 0x80 (3 bytes msg)

avrdude done.  Thank you.