And i decided to recompile fresh u-boot images for all capable routers. Here they are:
uboot_for_tp-link_tl-wr740n_v4.bin https://app.box.com/s/3pxe21ar1rsbi9b7ne1i
uboot_for_tp-link_tl-wr720n_v3_CH.bin https://app.box.com/s/epcyt2vpo435uklug5uh
uboot_for_tp-link_tl-wr710n.bin https://app.box.com/s/2q2uvhvfsnpwol5b2evb
uboot_for_tp-link_tl-wr703n.bin https://app.box.com/s/z13rrr8v8vdu70la67jn
uboot_for_tp-link_tl-mr3220_v2.bin https://app.box.com/s/v6jclan4ycu8mhphqrpf
uboot_for_tp-link_tl-mr3040.bin https://app.box.com/s/a0nw5w2hlmoz7giy8ll7
uboot_for_tp-link_tl-mr3020.bin https://app.box.com/s/yk395fpy7d2ukmd4tvgf
uboot_for_tp-link_tl-mr13u.bin https://app.box.com/s/ztfqxrdje9i36sw0edca
uboot_for_tp-link_tl-mr10u.bin https://app.box.com/s/kq1jqtb041em8uwzhfki
uboot_for_gs-oolite_v1_dev.bin https://app.box.com/s/o9blybah1xsnxt4bs0w1
uboot_for_dragino_v2_ms14.bin https://app.box.com/s/lw8cl6fzzouk6ilyxrkx
uboot_for_d-link_dir-505.bin https://app.box.com/s/fguydczy84zbahv3vtke
uboot_for_8devices_carambola2.bin https://app.box.com/s/9k2peuxxjjgb8mcxbrxb