Flashing with FlashTool - with me (noob)

Hello,
first im new in Xperia and Flashing with FlashTool.
It is possible to lost DRM keys without BL Unlock and only flash new (older) firmware ?
I had 26.1.A.2.99 and flashed 26.1.A.1.128 and it writed this:

Code:

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18/042/2015 08:42:58 - INFO  - Writing TA unit 0000084f. Value : [1A, CE, 33, 00, 01, 00, 08, 05, 00, 02, 02, 32, 00, 10, 03, 00, 02, 04, 02, 05, 00, 01, 02, 33, 00, 10, 05, 00, 03, 02, 0B, 00, 10, 02, 00, 05, 85, 05, 00, 05, 82, 33, 00, 10, 02, 00, 04, 85, 05, 00, 04, 82, 0B, 00, 10, 12, 00, 02, 00, 48, EE, BE, BA, 48, EE, 00, 00, A9, 09, BE, BA, A9, 09, 00, 00, 04, 00, 03, 00, 02, 00, 04, 00, 04, 00, B0, 04, 0E, 00, 06, 00, B8, 0B, 01, 4B, 00, 00, 00, 03, 96, 00, 2C, 01, 03, 00, 09, 00, 01]
18/042/2015 08:42:58 - INFO  - Writing TA unit 000008fd. Value : [00]

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and this

Code:

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18/051/2015 08:51:56 - INFO  - Writing TA unit 00002725. Value : [32, 30, 31, 35, 2D, 30, 39, 2D, 31, 38, 20, 30, 38, 3A, 35, 31, 3A, 35, 36, 00]
18/051/2015 08:51:57 - INFO  - Writing TA unit 00002774. Value : [00]

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I mean when first value was 32,30,31, etc. and second 00 it mean i lost DRM keys ? Or its normal ? Sorry, im really new with this..