The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  X  0  0  X  X  0  X 2X 4X 3X 4X  0 2X 4X 4X  X 2X 2X  X 3X 3X  X 3X 4X  0  X  0 2X 2X 4X 2X 2X 4X  0  X 4X 4X 3X 3X 3X  X 3X 4X  0 3X 3X 2X 4X 4X  X  X  X 2X 2X  0  0 2X 3X  X 2X 2X 3X  0 4X  0  0 3X 3X  0  0 2X  X 2X  X  0 4X 3X 3X 2X  0 2X 3X 3X  0 2X 3X  X  X  X  0  X 2X 3X  0  X 4X 2X 4X
 0  0  X  0 3X 2X  X 4X  0  X  X  X 3X 2X  0 2X 3X  X 2X 4X  0 3X 2X 3X 2X 4X  X 4X 4X 4X  0  X  X 3X 3X 2X  0 3X  0 2X 3X 3X  X  X 3X 4X 2X 3X 4X 4X  0  0 4X  0 3X 2X 2X 2X 4X  X  0 3X  0  0 3X  X 2X 2X 2X 3X  0  X 3X 2X  X 2X 3X  X  X 2X  0 3X  0 4X 2X  0  X  X 4X 3X  X  0  X 2X 3X 2X  0 4X 4X
 0  0  0  X 3X  X 4X 3X 3X 3X  0  X  X  0 3X  X 2X 2X 3X  0 4X  X 3X 3X  0 4X  X  0 3X 4X 4X 4X  X 4X 4X  0  X 3X  0 3X 4X  0 4X  0 2X 2X 2X 2X  0 4X  X 3X 2X 4X  X 2X  X 2X 3X 2X  X 4X 2X 3X  X 2X 4X 4X  0  0 4X 3X  X 4X  0  0  0  X 3X  X 2X 3X 3X 4X 3X  0 2X 3X  X 4X  X 4X  0  X 3X 4X 2X  0 2X

generates a code of length 99 over Z5[X]/(X^2) who´s minimum homogenous weight is 390.

Homogenous weight enumerator: w(x)=1x^0+316x^390+180x^395+2500x^396+24x^400+84x^415+16x^420+4x^495

The gray image is a linear code over GF(5) with n=495, k=5 and d=390.
This code was found by Heurico 1.16 in 4.21 seconds.