how to override signature check

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1

well yesterday i bought a new atmega 328p pu without boot loader.I have 2 unos both with the same ic i bought earlier but pre loaded with boot loader.The issue I am facing is that i get this error overtime though each and everything on my side is correct::

Arduino: 1.6.12 (Mac OS X), Board: "Arduino/Genuino Uno"

/Users/architbubber/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino9/bin/avrdude -C/Users/architbubber/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino9/etc/avrdude.conf -v -patmega328p -cstk500v1 -P/dev/cu.usbmodem1421 -b19200 -e -Ulock:w:0x3F:m -Uefuse:w:0xFD:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m 

avrdude: Version 6.3, compiled on Jan 17 2017 at 12:01:35
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "/Users/architbubber/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino9/etc/avrdude.conf"
         User configuration file is "/Users/architbubber/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : /dev/cu.usbmodem1421
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x15
         AVR Part                      : ATmega328P
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC2
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : STK500
         Description     : Atmel STK500 Version 1.x firmware
avrdude: stk500_recv(): programmer is not responding
         Hardware Version: -1550888708
         Firmware Version: 1.18
         Topcard         : Unknown
         Vtarget         : 0.0 V
         Varef           : 0.0 V
         Oscillator      : Off
         SCK period      : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.02s

avrdude: Device signature = 0xffffff (probably .reduced_core_tiny) (retrying)

Reading | ################################################## | 100% 0.02s

avrdude: Device signature = 0xffffff (probably .reduced_core_tiny) (retrying)

Error while burning bootloader.
Reading | ################################################## | 100% 0.02s

avrdude: Device signature = 0xffffff (probably .reduced_core_tiny)
avrdude: Yikes!  Invalid device signature.
         Double check connections and try again, or use -F to override
         this check.


avrdude done.  Thank you.

this is with verbose

2

i tried removing the signature check from the arduino isp program and the uploaded it but still received the same error .this is the first time i am facing such an issue since earlier also i had to reboot load the prior ics with uno loader since they came with decimilla installed.please help asap and what is -F and how to use it couldn't find on the whole net.

3

Such a big Forum of such a big community of developers and no one can answer
What man

4

Just put it in your command like this. It won't do any good because you are not communicating with your target chip.

So check the chip is inserted correctly and your wires are good and connected to the right pins.

/Users/architbubber/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino9/bin/avrdude -C/Users/architbubber/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino9/etc/avrdude.conf -v -patmega328p -cstk500v1 -P/dev/cu.usbmodem1421 -b19200  -F -e -Ulock:w:0x3F:m -Uefuse:w:0xFD:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m

5

You are getting garbage values for the signature, the issue is a wiring problem (or defective part). Bypassing the signature check will just give you a different error. AVRdude really should not mention bypassing the signature check in the error message, as it is not helpful debugging information.

Be sure to go back to the original version of Arduino as ISP.

6

Kprims couldn't quite understand how to put it in command please explain in detail.
And yes all the connections made are good no mistakes

7

Hit select /copy and paste into your terminal.

We have already told you that this will not help fix your problem.

/Users/architbubber/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino9/bin/avrdude -C/Users/architbubber/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino9/etc/avrdude.conf -v -patmega328p -cstk500v1 -P/dev/cu.usbmodem1421 -b19200  -F -e -Ulock:w:0x3F:m -Uefuse:w:0xFD:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m
8

:confused: so in my case the atmega seemed to be faulty since today I got brand new not bootloaded 328p pu from the same shop and it got bootloaded in the very first attempt.
Thank you all for helping me