preloader.bin: md5 OK; - The signature isn't found!

[GabrielT]

Hello everyone, I tell them, I have my phone died in state brick or soft brick, the PC detects it as MTK USB Port, I have a backup with mtk tools droid, try restore and revive the phone, BUT, the mtk droid tools did not While preloader.bin back gives this message:
preloader.bin: md5 OK; - The signature is not found!

and flash tools sp v3 does not recognize the preloader.bin, fails. the tools flash v5 recognized, but pulls error and quits .. this is my phone:

Hardware : MT6589
Board: mtk6589_e_lca
Model : GT-I9500
Build number : ALPS.JB7.MP.V1.14
Build date UTC : 20140919-015117
Android v : 4.4.4
Baseband v: MOLY.WR8.W1315.MD.WG.MP.V38, 2014/05/22 12:01
Kernel v : 3.4.39 (whl@server7) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #1 SMP Fri Sep 19 09:49:09 CST 2014
Uboot build v :
LCD Driver IC : 1-ili9806e_IVO_fwvga
Someone could tell me how I can flash my preloader.bin to revive my phone?