[HTC Rezound] a.mcdear:
ENG HBOOT 2.11 - never had 2.21 ever on my system.

Here's the details:

C:\Android>fastboot oem listpartition
...
(bootloader) [merge_mfg]:(MERGEMFG, 10) block start=0, size=0 (0 KB)
(bootloader) [merge_emmc]:(RAW, 4) block start=0, size=62078976 (76032332
(bootloader) 8 KB)
(bootloader) [sbl1]:(RAW, 4) block start=1, size=256 (1179039812 KB)
(bootloader) [sbl2]:(RAW, 4) block start=257, size=512 (-1936887672 KB)
(bootloader) [pg1fs]:(UNKNOWN, 4) block start=769, size=64734 (0 KB)
(bootloader) [board_info]:(RAW, 4) block start=65504, size=32 (147379976
(bootloader) KB)
(bootloader) [rfg_0]:(RAW, 4) block start=294915, size=2048 (842383904 KB
(bootloader) )
(bootloader) [rfg_1]:(RAW, 4) block start=296963, size=2048 (842383904 KB
(bootloader) )
(bootloader) [rfg_2]:(RAW, 4) block start=299011, size=2048 (842383904 KB
(bootloader) )
(bootloader) [rfg_3]:(RAW, 4) block start=301059, size=2048 (842383904 KB
(bootloader) )
(bootloader) [rfg_4]:(RAW, 4) block start=303107, size=2048 (842383904 KB
(bootloader) )
(bootloader) [rfg_5]:(RAW, 4) block start=305155, size=2048 (842383904 KB
(bootloader) )
(bootloader) [rfg_6]:(RAW, 4) block start=307203, size=2048 (842383904 KB
(bootloader) )
(bootloader) [rfg_7]:(RAW, 4) block start=309251, size=2046 (27866287 KB)
(bootloader) [mdmrfg_0]:(RAW, 4) block start=311298, size=2048 (842383904
(bootloader) KB)
(bootloader) [mdmrfg_1]:(RAW, 4) block start=313346, size=2048 (842383904
(bootloader) KB)
(bootloader) [mdmrfg_2]:(RAW, 4) block start=315394, size=2048 (842383904
(bootloader) KB)
(bootloader) [mdmrfg_3]:(RAW, 4) block start=317442, size=2048 (842383904
(bootloader) KB)
(bootloader) [mdmrfg_4]:(RAW, 4) block start=319490, size=2048 (842383904
(bootloader) KB)
(bootloader) [mdmrfg_5]:(RAW, 4) block start=321538, size=2048 (842383904
(bootloader) KB)
(bootloader) [mdmrfg_6]:(RAW, 4) block start=323586, size=2048 (842383904
(bootloader) KB)
(bootloader) [mdmsmem]:(RAW, 4) block start=325634, size=2045 (1768091127
(bootloader) KB)
(bootloader) [dzsystem]:(DEZERO, 8) block start=524289, size=2555902 (127
(bootloader) 7951 KB)
(bootloader) [dzdata]:(DEZERO, 8) block start=3145728, size=4980735 (2490
(bootloader) 367 KB)
(bootloader) [wimax]:(RAW, 7E01) block start=0, size=0 (0 KB)
(bootloader) [udata_wimax]:(RAW, 7E01) block start=0, size=0 (0 KB)
(bootloader) [spcustom]:(RAW, 1) block start=0, size=0 (0 KB)
(bootloader) [microp]:(OTHER, 1) block start=0, size=0 (0 KB)
(bootloader) [cpld]:(OTHER, 1) block start=0, size=0 (0 KB)
(bootloader) [a1026]:(OTHER, 1) block start=0, size=0 (0 KB)
(bootloader) [nfc]:(OTHER, 1) block start=0, size=0 (0 KB)
(bootloader) [tp]:(OTHER, 1) block start=0, size=0 (0 KB)
(bootloader) [gauge]:(OTHER, 1) block start=0, size=0 (0 KB)
(bootloader) [sar]:(OTHER, 1) block start=0, size=0 (0 KB)
(bootloader) [rcdata]:(OTHER, 1) block start=0, size=0 (0 KB)
(bootloader) [mdmrcdata]:(OTHER, 1) block start=0, size=0 (0 KB)
(bootloader) [mfg]:(RAW, 7301) block start=65537, size=512 (256 KB)
(bootloader) [pg2fs]:(UNKNOWN, 5B21) block start=66050, size=40885 (0 KB)
(bootloader) [sbl2_update]:(RAW, 5C01) block start=106936, size=512 (256
(bootloader) KB)
(bootloader) [sbl3]:(RAW, 4501) block start=107449, size=2048 (1024 KB)
(bootloader) [rpm]:(RAW, 4701) block start=109498, size=512 (256 KB)
(bootloader) [tz]:(RAW, 4601) block start=110011, size=4096 (2048 KB)
(bootloader) [hboot]:(RAW, 4C01) block start=114108, size=2048 (1024 KB)
(bootloader) [security_record]:(RAW, 3901) block start=116157, size=64 (3
(bootloader) 2 KB)
(bootloader) [sp1]:(RAW, 3401) block start=116222, size=12288 (6144 KB)
(bootloader) [wifi]:(RAW, 3601) block start=128511, size=2048 (1024 KB)
(bootloader) [misc2]:(RAW, 7601) block start=130560, size=512 (256 KB)
(bootloader) [radio]:(RAW, 7701) block start=131073, size=81920 (40960 KB
(bootloader) )
(bootloader) [mdm9k]:(RAW, 7701) block start=212994, size=81920 (40960 KB
(bootloader) )
(bootloader) [radio_config]:(RAW, 7401) block start=294915, size=16382 (8
(bootloader) 191 KB)
(bootloader) [mdm9k_config]:(RAW, 7401) block start=311298, size=16381 (8
(bootloader) 190 KB)
(bootloader) [adsp]:(RAW, 7A01) block start=327680, size=65536 (32768 KB)
(bootloader) [boot]:(RAW, 4801) block start=393217, size=32768 (16384 KB)
(bootloader) [recovery]:(RAW, 7101) block start=425986, size=32766 (16383
(bootloader) KB)
(bootloader) [misc]:(RAW, 7601) block start=458753, size=32763 (16381 KB)
(bootloader) [modem_st1]:(EXT3, 4A01) block start=491517, size=8192 (4096
(bootloader) KB)
(bootloader) [modem_st2]:(EXT3, 4B01) block start=499710, size=8192 (4096
(bootloader) KB)
(bootloader) [mdm_efs1]:(EXT3, 5901) block start=507903, size=8192 (4096
(bootloader) KB)
(bootloader) [mdm_efs2]:(EXT3, 5A01) block start=516096, size=8192 (4096
(bootloader) KB)
(bootloader) [system]:(EXT3, 8301) block start=524289, size=2555902 (1277
(bootloader) 951 KB)
(bootloader) [devlog]:(EXT3, 1901) block start=3080192, size=60884 (30442
(bootloader) KB)
(bootloader) [local]:(RAW, 3301) block start=3141077, size=4095 (2047 KB)
(bootloader) [debug_config]:(RAW, 8801) block start=3145173, size=8 (4 KB
(bootloader) )
(bootloader) [pdata]:(RAW, 2301) block start=3145182, size=512 (256 KB)
(bootloader) [control]:(RAW, 8901) block start=3145695, size=32 (16 KB)
(bootloader) [userdata]:(EXT3, 8301) block start=3145728, size=4980735 (2
(bootloader) 490367 KB)
(bootloader) [cache]:(EXT3, 8301) block start=8126464, size=655359 (32767
(bootloader) 9 KB)
(bootloader) [fat]:(RAW, C01) block start=8781824, size=21995520 (1099776
(bootloader) 0 KB)
(bootloader) [extra]:(RAW, 9001) block start=30777345, size=128 (64 KB)
OKAY [ 0.390s]
finished. total time: 0.390s