how to modify variable stored in rom?

char i = 0;
unsigned int addr, data_, dataAR[4][4] = {{0x3FAA+0,  0x3FAA+1,  0x3FAA+2,  0x3FAA+3},
                                          {0x3FAA+4,  0x3FAA+5,  0x3FAA+6,  0x3FAA+7},
                                          {0x3FAA+8,  0x3FAA+9,  0x3FAA+10, 0x3FAA+11},
                                          {0x3FAA+12, 0x3FAA+13, 0x3FAA+14, 0x3FAA+15}};

void main() {
  ANSEL  = 0;                         // Configure AN pins as digital
  ANSELH = 0;
  C1ON_bit = 0;                       // Disable comparators
  C2ON_bit = 0;
  PORTB = 0;                          // Initial PORTB value
  TRISB = 0;                          // Set PORTB as output
  PORTC = 0;                          // Initial PORTC value
  TRISC = 0;                          // Set PORTC as output
  Delay_ms(500);

  // All block writes
  // to program memory are done as 16-word erase by
  // eight-word write operations. The write operation is
  // edge-aligned and cannot occur across boundaries.
  // Therefore it is recommended to perform flash writes in 16-word chunks.
  // That is why lower 4 bits of start address [3:0] must be zero.
  // Since FLASH_Write routine performs writes in 4-word chunks,
  // we need to call it 4 times in a row.
  addr = 0x0430;                      // starting Flash address, valid for P16F887
  for (i = 0; i < 4; i++){            // Write some data to Flash
    Delay_ms(100);
    FLASH_Write(addr+i*4, dataAR[i]);
  }
  Delay_ms(500);

  addr = 0x0430;
  for (i = 0; i < 16; i++){
    data_ = FLASH_Read(addr++);       // P16's FLASH is 14-bit wide, so
    Delay_us(10);                     //   two MSB's will always be '00'
    PORTB = data_;                    // Display data on PORTB (LS Byte)
    PORTC = data_ >> 8;               // and PORTC (MS Byte)
    Delay_ms(500);
  }
}

const unsigned long sbox1[256]={0xd1310ba6, 0x98dfb5ac,  0x2ffd72db, 0xd01adfb7, 0xb8e1afed, 0x6a267e96,
    0xba7c9045, 0xf12c7f99,  0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16,
    0x636920d8, 0x71574e69,  0xa458fea3, 0xf4933d7e, 0x0d95748f, 0x728eb658,
    0x718bcd58, 0x82154aee,  0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
    0xc5d1b023, 0x286085f0,  0xca417918, 0xb8db38ef, 0x8e79dcb0, 0x603a180e,
    0x6c9e0e8b, 0xb01e8a3e,  0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60,
    0xe65525f3, 0xaa55ab94,  0x57489862, 0x63e81440, 0x55ca396a, 0x2aab10b6,
    0xb4cc5c34, 0x1141e8ce, 0xa15486af, 0x7c72e993, 0xb3ee1411,  0x636fbc2a,
    0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e, 0xafd6ba33,  0x6c24cf5c,
    0x7a325381, 0x28958677, 0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b,  0x66282193,
    0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032, 0xef845d5d,  0xe98575b1,
    0xdc262302, 0xeb651b88, 0x23893e81, 0xd396acc5, 0x0f6d6ff3,  0x83f44239,
    0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e, 0x21c66842,  0xf6e96c9a,
    0x670c9c61, 0xabd388f0, 0x6a51a0d2, 0xd8542f68, 0x960fa728,  0xab5133a3,
    0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98, 0xa1f1651d,  0x39af0176,
    0x66ca593e, 0x82430e88, 0x8cee8619, 0x456f9fb4, 0x7d84a5c3,  0x3b8b5ebe,
    0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6, 0x4ed3aa62,  0x363f7706,
    0x1bfedf72, 0x429b023d, 0x37d0d724, 0xd00a1248, 0xdb0fead3,  0x49f1c09b,
    0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7, 0xe3fe501a,  0xb6794c3b,
    0x976ce0bd, 0x04c006ba, 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2,  0x196a2463,
    0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f, 0x6dfc511f,  0x9b30952c,
    0xcc814544, 0xaf5ebd09, 0xbee3d004, 0xde334afd, 0x660f2807,  0x192e4bb3,
    0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb, 0x5579c0bd,  0x1a60320a,
    0xd6a100c6, 0x402c7279, 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8,  0xdb3222f8,
    0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab, 0x323db5fa,  0xfd238760,
    0x53317b48, 0x3e00df82, 0x9e5c57bb, 0xca6f8ca0, 0x1a87562e,  0xdf1769db,
    0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573, 0x695b27b0,  0xbbca58c8,
    0xe1ffa35d, 0xb8f011a0, 0x10fa3d98, 0xfd2183b8, 0x4afcb56c,  0x2dd1d35b,
    0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790, 0xe1ddf2da,  0xa4cb7e33,
    0x62fb1341, 0xcee4c6e8, 0xef20cada, 0x36774c01, 0xd07e9efe,  0x2bf11fb4,
    0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0, 0xd08ed1d0,  0xafc725e0,
    0x8e3c5b2f, 0x8e7594b7, 0x8ff6e2fb, 0xf2122b64, 0x8888b812,  0x900df01c,
    0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad, 0x2f2f2218,  0xbe0e1777,
    0xea752dfe, 0x8b021fa1, 0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6,  0xce89e299,
    0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9, 0x165fa266,  0x80957705,
    0x93cc7314, 0x211a1477, 0xe6ad2065, 0x77b5fa86, 0xc75442f5,  0xfb9d35cf,
    0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49, 0x00250e2d,  0x2071b35e,
    0x226800bb, 0x57b8e0af, 0x2464369b, 0xf009b91e, 0x5563911d,  0x59dfa6aa,
    0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5, 0x83260376,  0x6295cfa9,
    0x11c81968, 0x4e734a41, 0xb3472dca, 0x7b14a94a, 0x1b510052,  0x9a532915,
    0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400, 0x08ba6fb5,  0x571be91f,
    0xf296ec6b, 0x2a0dd915, 0xb6636521, 0xe7b9f9b6, 0xff34052e,  0xc5855664,
    0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a};