How could i play svf file correctly ?

Hi folks, When trying to execute my SVF file , Impact software provided by Xilinx issues errors like :

ScanDR 32 TDI(00000000) TDO(F286E093) Mask(0FFFFFFF) Smask(FFFFFFFF) ERROR:iMPACT - Failed ScanDR: TDO does not match Expected TDO ERROR:iMPACT - TDO ReadBack : 00000001 ERROR:iMPACT - TDO Expected : f286e093 EXCEPTION:iMPACT:SVFReader.c:335:1.20.14.1 - Scan Data Mismatch. INFO:iMPACT:2146 - Play svf failed. PROGRESS_END - End Operation. Elapsed time = 1 sec.11111

Moreover i want to want to know why within SVF file the ID check instruction is executed twice ? one with MASK and other one without MASK ? This conecrns also HIR,TIR,HDR,TDR instructions :

//Loading device with 'idcode' instruction. SIR 10 TDI (03c9) SMASK (03ff) ; SDR 32 TDI (00000000) SMASK (ffffffff) TDO (f286e093) MASK (0fffffff) ; TIR 0 ; HIR 0 ; TDR 0 ; HDR 0 ; TIR 0 ; HIR 0 ; TDR 0 ; HDR 0 ; TIR 0 ; HIR 0 ; HDR 0 ; TDR 0 ; //Loading device with 'idcode' instruction. SIR 10 TDI (03c9) ; SDR 32 TDI (00000000) TDO (f286e093) ;

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bamboutcha9999
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